diff --git a/codechicken/multipart/TileMultipart.scala b/codechicken/multipart/TileMultipart.scala
index 055b6fa..ae784da 100644
--- a/codechicken/multipart/TileMultipart.scala
+++ b/codechicken/multipart/TileMultipart.scala
@@ -38,6 +38,7 @@ import net.minecraft.entity.item.EntityItem
 import net.minecraft.entity.player.EntityPlayer
 import net.minecraft.entity.Entity
 import scala.collection.JavaConversions._
+import java.util.Collection
 
 class TileMultipart extends TileEntity
 {
@@ -77,7 +78,7 @@ class TileMultipart extends TileEntity
     
     def jPartList():List[TMultiPart] = partList
     
-    override def canUpdate() = doesTick//TODO: part merging true
+    override def canUpdate() = doesTick
     
     override def updateEntity()
     {
@@ -113,7 +114,22 @@ class TileMultipart extends TileEntity
             partList.foreach(_.onWorldSeparate())
     }
     
+    /**
+     * Called by parts when they have changed in some form that affects the world.
+     * Notifies neighbor blocks, parts that share this host and recalculates lighting
+     */
     def notifyPartChange(part:TMultiPart)
+    {
+        internalPartChange(part)
+        
+        worldObj.notifyBlocksOfNeighborChange(xCoord, yCoord, zCoord, getBlockType().blockID)
+        worldObj.updateAllLightTypes(xCoord, yCoord, zCoord)
+    }
+    
+    /**
+     * Notifies parts sharing this host of a change
+     */
+    def internalPartChange(part:TMultiPart)
     {
         TileMultipart.startOperation(this)
         partList.foreach{ p =>
@@ -121,9 +137,19 @@ class TileMultipart extends TileEntity
                 p.onPartChanged(part)
         }
         TileMultipart.finishOperation(this)
-        
-        worldObj.notifyBlocksOfNeighborChange(xCoord, yCoord, zCoord, getBlockType().blockID)
-        worldObj.updateAllLightTypes(xCoord, yCoord, zCoord)
+    }
+    
+    /**
+     * Notifies all parts not in the passed collection of a change from all the parts in the collection
+     */
+    def multiPartChange(parts:Collection[TMultiPart])
+    {
+        TileMultipart.startOperation(this)
+        partList.foreach{ p =>
+            if(!parts.contains(p))
+                parts.foreach(p.onPartChanged(_))
+        }
+        TileMultipart.finishOperation(this)
     }
     
     def onNeighborBlockChange(world:World, x:Int, y:Int, z:Int, id:Int)
diff --git a/codechicken/multipart/minecraft/ButtonPart.java b/codechicken/multipart/minecraft/ButtonPart.java
index 2ec0eb7..ce45a83 100644
--- a/codechicken/multipart/minecraft/ButtonPart.java
+++ b/codechicken/multipart/minecraft/ButtonPart.java
@@ -3,7 +3,7 @@ package codechicken.multipart.minecraft;
 import codechicken.lib.vec.BlockCoord;
 import codechicken.lib.vec.Cuboid6;
 import codechicken.lib.vec.Vector3;
-import codechicken.multipart.IRedstonePart;
+import codechicken.multipart.IFaceRedstonePart;
 import codechicken.multipart.TickScheduler;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockButton;
@@ -15,7 +15,7 @@ import net.minecraft.util.MovingObjectPosition;
 import net.minecraft.world.World;
 import net.minecraftforge.common.ForgeDirection;
 
-public class ButtonPart extends McSidedMetaPart implements IRedstonePart
+public class ButtonPart extends McSidedMetaPart implements IFaceRedstonePart
 {
     public static BlockButton stoneButton = (BlockButton) Block.stoneButton;
     public static BlockButton woodenButton = (BlockButton) Block.woodenButton;
@@ -181,4 +181,9 @@ public class ButtonPart extends McSidedMetaPart implements IRedstonePart
     {
         return 0x10;
     }
+    
+    @Override
+    public int getFace() {
+        return metaSideMap[meta&7];
+    }
 }
diff --git a/codechicken/multipart/minecraft/LeverPart.java b/codechicken/multipart/minecraft/LeverPart.java
index e99c812..438c2c6 100644
--- a/codechicken/multipart/minecraft/LeverPart.java
+++ b/codechicken/multipart/minecraft/LeverPart.java
@@ -11,9 +11,9 @@ import net.minecraft.world.World;
 import net.minecraftforge.common.ForgeDirection;
 import codechicken.lib.vec.BlockCoord;
 import codechicken.lib.vec.Cuboid6;
-import codechicken.multipart.IRedstonePart;
+import codechicken.multipart.IFaceRedstonePart;
 
-public class LeverPart extends McSidedMetaPart implements IRedstonePart
+public class LeverPart extends McSidedMetaPart implements IFaceRedstonePart
 {
     public static BlockLever lever = (BlockLever) Block.lever;
     public static int[] metaSideMap = new int[]{1, 4, 5, 2, 3, 0, 0, 1};
@@ -149,4 +149,9 @@ public class LeverPart extends McSidedMetaPart implements IRedstonePart
     {
         return 0x10;
     }
+    
+    @Override
+    public int getFace() {
+        return metaSideMap[meta&7];
+    }
 }
diff --git a/codechicken/multipart/minecraft/RedstoneTorchPart.java b/codechicken/multipart/minecraft/RedstoneTorchPart.java
index e565451..00e1919 100644
--- a/codechicken/multipart/minecraft/RedstoneTorchPart.java
+++ b/codechicken/multipart/minecraft/RedstoneTorchPart.java
@@ -10,11 +10,12 @@ import net.minecraft.world.World;
 import net.minecraftforge.common.ForgeDirection;
 import codechicken.lib.vec.BlockCoord;
 import codechicken.lib.vec.Cuboid6;
+import codechicken.multipart.IFaceRedstonePart;
 import codechicken.multipart.IRandomUpdateTick;
-import codechicken.multipart.IRedstonePart;
 import codechicken.multipart.RedstoneInteractions;
+import codechicken.multipart.TFacePart;
 
-public class RedstoneTorchPart extends TorchPart implements IRedstonePart, IRandomUpdateTick
+public class RedstoneTorchPart extends TorchPart implements IFaceRedstonePart, IRandomUpdateTick
 {
     public static BlockRedstoneTorch torchActive = (BlockRedstoneTorch) Block.torchRedstoneActive;
     public static BlockRedstoneTorch torchIdle = (BlockRedstoneTorch) Block.torchRedstoneIdle;
@@ -231,4 +232,9 @@ public class RedstoneTorchPart extends TorchPart implements IRedstonePart, IRand
     {
         return true;
     }
+    
+    @Override
+    public int getFace() {
+        return metaSideMap[meta*7];
+    }
 }
diff --git a/dependancies.info b/dependancies.info
index 5dab9d3..e6583e4 100644
--- a/dependancies.info
+++ b/dependancies.info
@@ -3,5 +3,5 @@
 	"file": "CodeChickenLib-universal-@MCVERSION@-@VERSION@.jar",
 	"dev": "CodeChickenLib-dev-@MCVERSION@-@VERSION@.jar",
 	"class": "codechicken.lib.asm.ASMHelper",
-	"version": "1.0.0.21"
+	"version": "1.0.0.22"
 }
\ No newline at end of file