diff --git a/src/net/torvald/terrarum/GameCrashHandler.kt b/src/net/torvald/terrarum/GameCrashHandler.kt
index 2a8b0d6c8..c5aa0c4d3 100644
--- a/src/net/torvald/terrarum/GameCrashHandler.kt
+++ b/src/net/torvald/terrarum/GameCrashHandler.kt
@@ -22,7 +22,7 @@ class GameCrashHandler(e: Throwable) : JFrame() {
 
     private val outputStream = object : OutputStream() {
         override fun write(p0: Int) {
-            htmlSB.appendCodePoint(p0)
+            htmlSB.append((p0 and 255).toChar())
         }
     }
 
diff --git a/src/net/torvald/terrarum/Terrarum.kt b/src/net/torvald/terrarum/Terrarum.kt
index 51fdf8c97..ddd57c11f 100644
--- a/src/net/torvald/terrarum/Terrarum.kt
+++ b/src/net/torvald/terrarum/Terrarum.kt
@@ -278,6 +278,15 @@ object Terrarum : Disposable {
         INVALID, CENTRE, LEFT, BOTTOM, RIGHT, TOP
     }
 
+    fun SubtileVector.toInt() = when (this) {
+        SubtileVector.INVALID -> throw IllegalArgumentException()
+        SubtileVector.RIGHT -> 1
+        SubtileVector.BOTTOM -> 2
+        SubtileVector.LEFT -> 4
+        SubtileVector.TOP    -> 8
+        SubtileVector.CENTRE -> 0
+    }
+
     data class MouseSubtile4(val x: Int, val y: Int, val vector: SubtileVector) {
 
         val nx = when (vector) {
@@ -286,7 +295,7 @@ object Terrarum : Disposable {
             SubtileVector.BOTTOM -> x
             SubtileVector.LEFT   -> x - 1
             SubtileVector.TOP    -> x
-            else -> throw IllegalArgumentException("Invalid vector index $vector for subtile $this")
+            else -> x
         }
 
         val ny = when (vector) {
@@ -295,7 +304,7 @@ object Terrarum : Disposable {
             SubtileVector.BOTTOM -> y + 1
             SubtileVector.LEFT   -> y
             SubtileVector.TOP    -> y - 1
-            else -> throw IllegalArgumentException("Invalid vector index $vector for subtile $this")
+            else -> y
         }
 
         val currentTileCoord = x to y
diff --git a/src/net/torvald/terrarum/gameworld/GameWorld.kt b/src/net/torvald/terrarum/gameworld/GameWorld.kt
index 1506f6b96..96b8a84a1 100644
--- a/src/net/torvald/terrarum/gameworld/GameWorld.kt
+++ b/src/net/torvald/terrarum/gameworld/GameWorld.kt
@@ -354,21 +354,16 @@ open class GameWorld() : Disposable {
                 Terrarum.ingame?.queueWireChangedEvent(tile, true, x, y)
                 Terrarum.ingame?.modified(LandUtil.LAYER_WIRE, x, y)
             }
-            /*
-            // figure out wiring graphs
-            val matchingNeighbours = WireActor.WIRE_NEARBY.mapIndexed { index, (tx, ty) ->
-                (getAllWiresFrom(x + tx, y + ty)?.contains(tile) == true).toInt() shl index
-            }.sum()
-            for (i in 0..3) {
-                if (matchingNeighbours and WIRE_POS_MAP[i] > 0) {
-                    val (tx, ty) = WireActor.WIRE_NEARBY[i]
-                    val old = getWireGraphOf(x + tx, y + ty, tile) ?: 0
-                    setWireGraphOf(x + tx, y + ty, tile, old and (15 - WIRE_ANTIPOS_MAP[i]))
-                }
-            }
 
+            // disconnect neighbouring nodes
+            /* RIGHT */getWireGraphOf(x+1, y, tile)?.let { setWireGraphOf(x+1, y, tile, it and 0b1011) }
+            /* BOTTOM */if (y+1 < height) getWireGraphOf(x, y+1, tile)?.let { setWireGraphOf(x, y+1, tile, it and 0b0111) }
+            /* LEFT */getWireGraphOf(x-1, y, tile)?.let { setWireGraphOf(x-1, y, tile, it and 0b1110) }
+            /* TOP */if (y-1 >= 0) getWireGraphOf(x, y-1, tile)?.let { setWireGraphOf(x, y-1, tile, it and 0b1101) }
+
+            // remove wire from this tile
             wiringGraph[blockAddr]!!.remove(tile)
-            wirings[blockAddr]!!.ws.remove(tile)*/
+            wirings[blockAddr]!!.ws.remove(tile)
         }
     }
 
diff --git a/src/net/torvald/terrarum/modulebasegame/gameitems/BlockBase.kt b/src/net/torvald/terrarum/modulebasegame/gameitems/BlockBase.kt
index 858b3a10e..9615335c2 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameitems/BlockBase.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameitems/BlockBase.kt
@@ -76,6 +76,10 @@ object BlockBase {
         (Terrarum.ingame!! as TerrarumIngame).selectedWireRenderClass = ""
     }
 
+    private val wireVectorChars = arrayOf(
+            "· · · ·","· · · →","· · ↓ ·","· · ↓ →","· ← · ·","· ← · →","· ← ↓ ·","· ← ↓ →","↑ · · ·","↑ · · →","↑ · ↓ ·","↑ · ↓ →","↑ ← · ·","↑ ← · →","↑ ← ↓ ·","↑ ← ↓ →",
+    )
+    fun Int.toWireVectorBitsStr(): String = "[${wireVectorChars[this]}]($this)"
     fun Int.wireNodeMirror() = this.shl(4).or(this).ushr(2).and(15)
     fun wireNodesConnectedEachOther(oldToNewVector: Int, new: Int?, old: Int?): Boolean {
         return if (new == null || old == null || oldToNewVector == 0) false
@@ -86,7 +90,7 @@ object BlockBase {
             val q = newToOldVector and new
             if (p == 0 && q == 0) false
             else if (p > 0 && q > 0) true
-            else throw IllegalStateException("oldToNewVector = $oldToNewVector, new = $new, old == $old")
+            else throw IllegalStateException("oldToNewVector = ${oldToNewVector.toWireVectorBitsStr()}, new = ${new.toWireVectorBitsStr()}, old = ${old.toWireVectorBitsStr()}")
         }
     }
 
diff --git a/src/net/torvald/terrarum/modulebasegame/gameitems/WireCutterAll.kt b/src/net/torvald/terrarum/modulebasegame/gameitems/WireCutterAll.kt
index a8008993e..1b6809315 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameitems/WireCutterAll.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameitems/WireCutterAll.kt
@@ -3,17 +3,19 @@ package net.torvald.terrarum.modulebasegame.gameitems
 import com.badlogic.gdx.graphics.g2d.TextureRegion
 import net.torvald.terrarum.CommonResourcePool
 import net.torvald.terrarum.Terrarum
+import net.torvald.terrarum.Terrarum.toInt
 import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZED
 import net.torvald.terrarum.gameactors.ActorWithBody
 import net.torvald.terrarum.gameitems.GameItem
 import net.torvald.terrarum.gameitems.ItemID
 import net.torvald.terrarum.gameitems.mouseInInteractableRangeTools
-import net.torvald.terrarum.gameworld.GameWorld
 import net.torvald.terrarum.itemproperties.Material
 import net.torvald.terrarum.modulebasegame.TerrarumIngame
 import net.torvald.terrarum.modulebasegame.gameactors.DroppedItem
+import net.torvald.terrarum.modulebasegame.gameitems.BlockBase.wireNodeMirror
 import net.torvald.terrarum.notEmptyOrNull
 import net.torvald.terrarum.toInt
+import net.torvald.terrarum.utils.WiringGraphMap
 
 /**
  * Modular approach to the wire cutter function
@@ -22,8 +24,12 @@ import net.torvald.terrarum.toInt
  */
 object WireCutterBase {
 
-    private fun disconnect(world: GameWorld, item: ItemID, x1: Int, y1: Int, x2: Int, y2: Int) {
+    private fun disconnect(item: ItemID, mapP: WiringGraphMap, mapN: WiringGraphMap, subTile: Terrarum.SubtileVector) {
+        val pBitMask = subTile.toInt() // bit mask to turn off
+        val nBitMask = pBitMask.wireNodeMirror()
 
+        mapP[item]!!.cnx = mapP[item]!!.cnx and (15 - pBitMask) // (15 - pBitMask) -> bit mask to retain
+        mapN[item]!!.cnx = mapN[item]!!.cnx and (15 - nBitMask)
     }
 
     fun startPrimaryUse(item: GameItem, actor: ActorWithBody, delta: Float, wireFilter: (ItemID) -> Boolean) = mouseInInteractableRangeTools(actor, item) {
@@ -37,7 +43,7 @@ object WireCutterBase {
 
         if (mvec == Terrarum.SubtileVector.CENTRE) {
             val wireNet = ingame.world.getAllWiresFrom(mtx, mty)
-            val wireItems = wireNet.first?.cloneToList()
+            val wireItems = wireNet.first
 
             wireItems?.filter(wireFilter)?.notEmptyOrNull()?.forEach {
                 ingame.world.removeTileWire(mtx, mty, it, false)
@@ -50,16 +56,16 @@ object WireCutterBase {
             val (ntx, nty) = mouseTile.nextTileCoord
 
             val wireNetP = ingame.world.getAllWiresFrom(mtx, mty)
-            val wireNetN = ingame.world.getAllWiresFrom(mtx, mty)
-            val wireItemsP = wireNetP.first?.cloneToList()
-            val wireItemsN = wireNetN.first?.cloneToList()
+            val wireNetN = ingame.world.getAllWiresFrom(ntx, nty)
+            val wireItemsP = wireNetP.first
+            val wireItemsN = wireNetN.first
 
             // get intersection of wireItemsP and wireItemsN
             if (wireItemsP != null && wireItemsN != null) {
                 val wireItems = wireItemsP intersect wireItemsN
 
                 wireItems.filter(wireFilter).notEmptyOrNull()?.forEach {
-                    disconnect(ingame.world, it, mtx, mty, ntx, nty)
+                    disconnect(it, wireNetP.second!!, wireNetN.second!!, mouseTile.vector)
                 } ?: return@mouseInInteractableRangeTools false
 
                 true