diff --git a/src/main/resources/assets/opencomputers/lang/en_US.lang b/src/main/resources/assets/opencomputers/lang/en_US.lang
index f70ba77dd..de652e164 100644
--- a/src/main/resources/assets/opencomputers/lang/en_US.lang
+++ b/src/main/resources/assets/opencomputers/lang/en_US.lang
@@ -16,6 +16,7 @@ tile.oc.chameliumBlock.name=Block of Chamelium
 tile.oc.charger.name=Charger
 tile.oc.disassembler.name=Disassembler
 tile.oc.diskDrive.name=Disk Drive
+tile.oc.endstone.name=End Stone
 tile.oc.geolyzer.name=Geolyzer
 tile.oc.hologram1.name=Hologram Projector (Tier 1)
 tile.oc.hologram2.name=Hologram Projector (Tier 2)
@@ -261,6 +262,7 @@ oc:tooltip.DiskDrive=Allows reading and writing floppies. Can be installed in ro
 oc:tooltip.Drone=Drones are light-weight, fast reconnaissance units with limited cargo space.
 oc:tooltip.DroneCase=This casing is used to build Drones in the assembler. It has room for a small amount of components and provides endstone-powered levitation.
 oc:tooltip.EEPROM=Small, programmable storage that contains the BIOS computers use to boot.
+oc:tooltip.FakeEndstone=Almost as good as the real thing, even emulates its floatiness!
 oc:tooltip.Geolyzer=Allows scanning the surrounding area's blocks' hardness. This information can be useful for generating holograms of the area or for detecting ores.
 oc:tooltip.GraphicsCard=Used to change what's displayed on screens.[nl] Maximum resolution: §f%sx%s§7[nl] Maximum color depth: §f%s§7[nl] Operations/tick: §f%s§7
 oc:tooltip.InkCartridge=Used to refill ink in 3D printers. For mysterious reasons it does not have to remain in the printer.
diff --git a/src/main/resources/assets/opencomputers/recipes/default.recipes b/src/main/resources/assets/opencomputers/recipes/default.recipes
index d80b8745b..b3d54f0fa 100644
--- a/src/main/resources/assets/opencomputers/recipes/default.recipes
+++ b/src/main/resources/assets/opencomputers/recipes/default.recipes
@@ -36,25 +36,16 @@ luaBios {
   type: shapeless
   input: ["oc:eeprom", "oc:manual"]
 }
-generic: [
-  {
-    result: {block="minecraft:end_stone"}
-    input: [[enderPearl, sandstone, enderPearl]
-            [sandstone, blockCoal, sandstone]
-            [enderPearl, sandstone, enderPearl]]
-    output: 4
-  }
-]
 
 droneCase1 {
-  input: [[{block="minecraft:end_stone"}, compass, {block="minecraft:end_stone"}]
+  input: [["oc:stoneEndstone", compass, "oc:stoneEndstone"]
           ["oc:circuitChip1", "oc:microcontrollerCase1", "oc:circuitChip1"]
-          [{block="minecraft:end_stone"}, "oc:componentBus2", {block="minecraft:end_stone"}]]
+          ["oc:stoneEndstone", "oc:componentBus2", "oc:stoneEndstone"]]
 }
 droneCase2 {
-  input: [[{block="minecraft:end_stone"}, compass, {block="minecraft:end_stone"}]
+  input: [["oc:stoneEndstone", compass, "oc:stoneEndstone"]
           ["oc:circuitChip2", "oc:microcontrollerCase2", "oc:circuitChip2"]
-          [{block="minecraft:end_stone"}, "oc:componentBus3", {block="minecraft:end_stone"}]]
+          ["oc:stoneEndstone", "oc:componentBus3", "oc:stoneEndstone"]]
 }
 microcontrollerCase1 {
   input: [[nuggetIron, "oc:circuitChip1", nuggetIron]
@@ -374,6 +365,13 @@ chameliumBlock {
           ["oc:chamelium", "oc:chamelium", "oc:chamelium"],
           ["oc:chamelium", "oc:chamelium", "oc:chamelium"]]
 }
+
+endstone {
+  input: [[enderPearl, "oc:chameliumBlock", enderPearl]
+          ["oc:chameliumBlock", enderPearl, "oc:chameliumBlock"]
+          [enderPearl, "oc:chameliumBlock", enderPearl]]
+  output: 4
+}
 inkCartridgeEmpty {
   input: [[nuggetIron, dispenser, nuggetIron],
           ["oc:materialTransistor", bucket, "oc:materialTransistor"],
diff --git a/src/main/scala/li/cil/oc/Constants.scala b/src/main/scala/li/cil/oc/Constants.scala
index 992937a4e..1a591e37b 100644
--- a/src/main/scala/li/cil/oc/Constants.scala
+++ b/src/main/scala/li/cil/oc/Constants.scala
@@ -18,6 +18,7 @@ object Constants {
     final val Charger = "charger"
     final val Disassembler = "disassembler"
     final val DiskDrive = "diskDrive"
+    final val Endstone = "endstone"
     final val Geolyzer = "geolyzer"
     final val HologramTier1 = "hologram1"
     final val HologramTier2 = "hologram2"
diff --git a/src/main/scala/li/cil/oc/client/renderer/tileentity/RobotRenderer.scala b/src/main/scala/li/cil/oc/client/renderer/tileentity/RobotRenderer.scala
index aec3020d4..1ca918ed8 100644
--- a/src/main/scala/li/cil/oc/client/renderer/tileentity/RobotRenderer.scala
+++ b/src/main/scala/li/cil/oc/client/renderer/tileentity/RobotRenderer.scala
@@ -353,8 +353,11 @@ object RobotRenderer extends TileEntitySpecialRenderer {
             GL11.glTranslatef(0, -8 * 0.0625F - 0.0078125F, -0.5F)
 
             if (robot.isAnimatingSwing) {
-              val remaining = (robot.animationTicksLeft - f) / robot.animationTicksTotal.toDouble
-              GL11.glRotatef((Math.sin(remaining * Math.PI) * 45).toFloat, 1, 0, 0)
+              val wantedTicksPerCycle = 10
+              val cycles = math.max(robot.animationTicksTotal / wantedTicksPerCycle, 1)
+              val ticksPerCycle = robot.animationTicksTotal / cycles
+              val remaining = (robot.animationTicksLeft - f) / ticksPerCycle.toDouble
+              GL11.glRotatef((Math.sin((remaining - remaining.toInt) * Math.PI) * 45).toFloat, 1, 0, 0)
             }
 
             val item = stack.getItem
diff --git a/src/main/scala/li/cil/oc/common/Proxy.scala b/src/main/scala/li/cil/oc/common/Proxy.scala
index 60af034f1..f122b6f30 100644
--- a/src/main/scala/li/cil/oc/common/Proxy.scala
+++ b/src/main/scala/li/cil/oc/common/Proxy.scala
@@ -60,6 +60,9 @@ class Proxy {
     // oredict entry, but not normal obsidian, breaking some recipes.
     OreDictionary.registerOre("obsidian", net.minecraft.init.Blocks.obsidian)
 
+    // To still allow using normal endstone for crafting drones.
+    OreDictionary.registerOre("oc:stoneEndstone", net.minecraft.init.Blocks.end_stone)
+
     OpenComputers.log.info("Initializing OpenComputers API.")
 
     api.CreativeTab.instance = CreativeTab
diff --git a/src/main/scala/li/cil/oc/common/block/ChameliumBlock.scala b/src/main/scala/li/cil/oc/common/block/ChameliumBlock.scala
index 810336910..bd773e942 100644
--- a/src/main/scala/li/cil/oc/common/block/ChameliumBlock.scala
+++ b/src/main/scala/li/cil/oc/common/block/ChameliumBlock.scala
@@ -1,6 +1,7 @@
 package li.cil.oc.common.block
 
 import li.cil.oc.util.Color
+import net.minecraft.block.material.Material
 import net.minecraft.block.properties.PropertyEnum
 import net.minecraft.block.state.BlockState
 import net.minecraft.block.state.IBlockState
@@ -12,7 +13,7 @@ object ChameliumBlock {
   final val Color = PropertyEnum.create("color", classOf[EnumDyeColor])
 }
 
-class ChameliumBlock extends SimpleBlock {
+class ChameliumBlock extends SimpleBlock(Material.rock) {
   setDefaultState(blockState.getBaseState.withProperty(ChameliumBlock.Color, EnumDyeColor.BLACK))
 
   @SideOnly(Side.CLIENT)
diff --git a/src/main/scala/li/cil/oc/common/block/FakeEndstone.scala b/src/main/scala/li/cil/oc/common/block/FakeEndstone.scala
new file mode 100644
index 000000000..5f0f11b93
--- /dev/null
+++ b/src/main/scala/li/cil/oc/common/block/FakeEndstone.scala
@@ -0,0 +1,8 @@
+package li.cil.oc.common.block
+
+import net.minecraft.block.material.Material
+
+class FakeEndstone extends SimpleBlock(Material.rock) {
+  setHardness(3)
+  setResistance(15)
+}
diff --git a/src/main/scala/li/cil/oc/common/block/Keyboard.scala b/src/main/scala/li/cil/oc/common/block/Keyboard.scala
index 246e4472a..391b80891 100644
--- a/src/main/scala/li/cil/oc/common/block/Keyboard.scala
+++ b/src/main/scala/li/cil/oc/common/block/Keyboard.scala
@@ -6,6 +6,7 @@ import li.cil.oc.api
 import li.cil.oc.common.tileentity
 import li.cil.oc.util.ExtendedEnumFacing._
 import net.minecraft.block.Block
+import net.minecraft.block.material.Material
 import net.minecraft.block.state.IBlockState
 import net.minecraft.entity.player.EntityPlayer
 import net.minecraft.util.AxisAlignedBB
@@ -15,7 +16,7 @@ import net.minecraft.world.IBlockAccess
 import net.minecraft.world.World
 import org.lwjgl.opengl.GL11
 
-class Keyboard extends SimpleBlock with traits.OmniRotatable {
+class Keyboard extends SimpleBlock(Material.rock) with traits.OmniRotatable {
   setLightOpacity(0)
 
   // For Immibis Microblock support.
diff --git a/src/main/scala/li/cil/oc/common/init/Blocks.scala b/src/main/scala/li/cil/oc/common/init/Blocks.scala
index e15a8af9b..c59427f83 100644
--- a/src/main/scala/li/cil/oc/common/init/Blocks.scala
+++ b/src/main/scala/li/cil/oc/common/init/Blocks.scala
@@ -70,5 +70,8 @@ object Blocks {
     Items.registerBlock(new Print(), Constants.BlockName.Print)
     Items.registerBlock(new RobotAfterimage(), Constants.BlockName.RobotAfterimage)
     Items.registerBlock(new RobotProxy(), Constants.BlockName.Robot)
+
+    // v1.5.10
+    Recipes.addBlock(new FakeEndstone(), Constants.BlockName.Endstone, "oc:stoneEndstone")
   }
 }
diff --git a/src/main/scala/li/cil/oc/common/tileentity/Robot.scala b/src/main/scala/li/cil/oc/common/tileentity/Robot.scala
index e0a42f004..3c050eeb7 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/Robot.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/Robot.scala
@@ -353,7 +353,7 @@ class Robot extends traits.Computer with traits.PowerInformation with traits.Rot
   }
 
   def setAnimateSwing(ticks: Int) {
-    animationTicksTotal = ticks
+    animationTicksTotal = math.max(ticks, 5)
     prepareForAnimation()
     swingingTool = true
   }
diff --git a/src/main/scala/li/cil/oc/server/agent/Player.scala b/src/main/scala/li/cil/oc/server/agent/Player.scala
index 13872f754..0b75437eb 100644
--- a/src/main/scala/li/cil/oc/server/agent/Player.scala
+++ b/src/main/scala/li/cil/oc/server/agent/Player.scala
@@ -8,6 +8,7 @@ import li.cil.oc.Settings
 import li.cil.oc.api.event._
 import li.cil.oc.api.internal
 import li.cil.oc.api.network.Connector
+import li.cil.oc.common.EventHandler
 import li.cil.oc.integration.Mods
 import li.cil.oc.integration.util.PortalGun
 import li.cil.oc.integration.util.TinkersConstruct
@@ -273,7 +274,7 @@ class Player(val agent: internal.Agent) extends FakePlayer(agent.world.asInstanc
     }, repair = false)
   }
 
-  def clickBlock(pos: BlockPos, side: EnumFacing): Double = {
+  def clickBlock(pos: BlockPos, side: EnumFacing, immediate: Boolean = false): Double = {
     callUsingItemInSlot(agent.equipmentInventory, 0, stack => {
       if (shouldCancel(() => ForgeEventFactory.onPlayerInteract(this, Action.LEFT_CLICK_BLOCK, world, pos, side))) {
         return 0
@@ -350,6 +351,13 @@ class Player(val agent: internal.Agent) extends FakePlayer(agent.world.asInstanc
         return 0
       }
 
+      if (!immediate) {
+        EventHandler.schedule(() => new DamageOverTime(this, pos, side, (adjustedBreakTime * 20).toInt).tick())
+        return adjustedBreakTime
+      }
+
+      world.sendBlockBreakProgress(-1, pos, -1)
+
       world.playAuxSFXAtEntity(this, 2001, pos, Block.getIdFromBlock(block) + (metadata << 12))
 
       if (stack != null) {
@@ -542,4 +550,34 @@ class Player(val agent: internal.Agent) extends FakePlayer(agent.world.asInstanc
   override def displayGUIHorse(horse: EntityHorse, inventory: IInventory) {}
 
   override def openEditSign(signTile: TileEntitySign) {}
+
+  // ----------------------------------------------------------------------- //
+
+  class DamageOverTime(val player: Player, val pos: BlockPos, val side: EnumFacing, val ticksTotal: Int) {
+    val world = player.world
+    var ticks = 0
+    var lastDamageSent = 0
+
+    def tick(): Unit = {
+      // Cancel if the agent stopped or our action is invalidated some other way.
+      if (world != player.world || !world.isBlockLoaded(pos) || world.isAirBlock(pos) || !player.agent.machine.isRunning) {
+        world.sendBlockBreakProgress(-1, pos, -1)
+        return
+      }
+
+      val damage = 10 * ticks / math.max(ticksTotal, 1)
+      if (damage >= 10) {
+        player.clickBlock(pos, side, immediate = true)
+      }
+      else {
+        ticks += 1
+        if (damage != lastDamageSent) {
+          lastDamageSent = damage
+          world.sendBlockBreakProgress(-1, pos, damage)
+        }
+        EventHandler.schedule(() => tick())
+      }
+    }
+  }
+
 }