diff --git a/sparkcore/energy.lua b/sparkcore/energy.lua
index ff43b48..eceb6dd 100644
--- a/sparkcore/energy.lua
+++ b/sparkcore/energy.lua
@@ -65,8 +65,8 @@ local function net_build(pos, callerpos, master_arg)
       local node = minetest.get_node(nodepos)
       local meta = minetest.get_meta(nodepos)
       local net_passive = minetest.get_item_group(node.name,"sparktech_net_passive")
-      if (not net_passive and meta:get_int("sparktech_net_passive") == 1) then
-        net_passive = true
+      if (net_passive == 0 and meta:get_int("sparktech_net_passive") == 1) then
+        net_passive = 1
       end
       local net_trigger = minetest.get_item_group(node.name,"sparktech_net_trigger")
       -- net passives are followed along to create the network (aka cables) but they do not get power,
@@ -86,8 +86,8 @@ local function net_build(pos, callerpos, master_arg)
 	-- Now the node shouldn’t be processed by the net_build anymore
 	processed[#processed + 1] = nodepos
       end
-      if (net_passive == 1 or ntrigontrig) then
-	 net_build(nodepos, pos)
+      if (net_passive ~= 0 or ntrigontrig) then
+		  net_build(nodepos, pos)
       end
     end
   end
@@ -102,32 +102,38 @@ local function net_build(pos, callerpos, master_arg)
   return -- at this point all nodes have been processed, so we can return to the calling node
 end
 
+local function add_node(pos, newnode)
+	local meta = minetest.get_meta(pos)
+	if (minetest.get_item_group(newnode.name, "sparktech_net_passive") == 1 or meta:get_int("sparktech_net_passive") ~= 0) then
+		net_build(pos) -- only call this with none if the node really is not a trigger, otherwise the net will be build from it but it will not be contained
+	elseif (minetest.get_item_group(newnode.name, "sparktech_net_trigger") == 1 ) then
+		meta:set_string("net_master", nil)
+		net_build(pos, nil, pos)
+	end
+end
 
 minetest.register_on_placenode(function(pos, newnode, placer, oldnode, itemstack, pointed_thing)
-  if (minetest.get_item_group(itemstack:get_name(), "sparktech_net_passive") == 1 ) then
-    net_build(pos) -- only call this with none if the node really is not a trigger, otherwise the net will be build from it but it will not be contained
-  elseif (minetest.get_item_group(itemstack:get_name(), "sparktech_net_trigger") == 1 ) then
-    net_build(pos, nil, pos)
-  end
+		add_node(pos, newnode)
 end)
 
-minetest.register_on_dignode(function(pos, oldnode, digger)
-    if ((minetest.get_item_group(oldnode.name, "sparktech_net_passive") == 1) or (minetest.get_item_group(oldnode.name, "sparktech_net_trigger") == 1)) then
-      local top = {x = pos.x, y = pos.y + 1, z = pos.z}
-      local bottom = {x = pos.x, y = pos.y - 1, z = pos.z}
-      local left = {x = pos.x - 1, y = pos.y, z = pos.z}
-      local right = {x = pos.x + 1, y = pos.y, z = pos.z}
-      local front = {x = pos.x, y = pos.y, z = pos.z - 1}
-      local back = {x = pos.x, y = pos.y, z = pos.z + 1}
-      for sidename, nodepos in pairs({top=top, bottom=bottom, left=left, right=right, front=front, back=back}) do
-	local target_node = minetest.get_node(nodepos)
-	local meta = minetest.get_meta(nodepos)
-	if (minetest.get_item_group(target_node.name, "sparktech_net_passive") == 1) then
-	  net_build(nodepos)
-	elseif (minetest.get_item_group(target_node.name, "sparktech_net_trigger") == 1) then
-	  meta:set_string("net_master", nil)
-	  net_build(nodepos, nil, nodepos)
-	end
-      end
+local function remove_node(pos, oldnode, force)
+	if (force or (minetest.get_item_group(oldnode.name, "sparktech_net_passive") == 1) or (minetest.get_item_group(oldnode.name, "sparktech_net_trigger") == 1)) then
+		local top = {x = pos.x, y = pos.y + 1, z = pos.z}
+		local bottom = {x = pos.x, y = pos.y - 1, z = pos.z}
+		local left = {x = pos.x - 1, y = pos.y, z = pos.z}
+		local right = {x = pos.x + 1, y = pos.y, z = pos.z}
+		local front = {x = pos.x, y = pos.y, z = pos.z - 1}
+		local back = {x = pos.x, y = pos.y, z = pos.z + 1}
+		for sidename, nodepos in pairs({top=top, bottom=bottom, left=left, right=right, front=front, back=back}) do
+			local target_node = minetest.get_node(nodepos)
+			add_node(nodepos, target_node)
+		end
     end
+end
+
+minetest.register_on_dignode(function(pos, oldnode, digger)
+		remove_node(pos, oldnode, true) -- FIXME Get rid of this! Somehow detect if a dynamic net_passive node is destroyed instead of updating speculatively
 end)
+
+sparktech.add_node_to_net = add_node
+sparktech.remove_node_from_net = remove_node
diff --git a/sparkwrench/cableinserter.lua b/sparkwrench/cableinserter.lua
new file mode 100644
index 0000000..5b57971
--- /dev/null
+++ b/sparkwrench/cableinserter.lua
@@ -0,0 +1,33 @@
+local NAME = minetest.get_current_modname()
+
+minetest.register_tool(NAME .. ":cableinserter", {
+						   description = "Cable Inserter",
+						   inventory_image = "multimeter.png",
+						   stack_max = 1,
+						   on_place = function(itemstack, placer, pointed_thing)
+							   -- TODO Check that nodes does not already interact with the grid
+							   if pointed_thing["type"] == "node" then
+								   local node = minetest.get_node(pointed_thing.under)
+								   local meta = minetest.get_meta(pointed_thing.under)
+								   if meta:get_int("sparktech_net_passive") == 1 then
+									   meta:set_int("sparktech_net_passive", 0)
+									   sparktech.remove_node_from_net(pointed_thing.under, node, true)
+									   minetest.debug("Removed cable")
+								   else
+									   meta:set_int("sparktech_net_passive", 1)
+									   sparktech.add_node_to_net(pointed_thing.under, node)
+									   minetest.debug("Added cable")
+								   end
+							   end
+							   return itemstack
+						   end
+})
+
+minetest.register_craft({
+		output = NAME .. ":cableinserter",
+		recipe = {
+			{ "group:steelplate", "", "" },
+			{ "", "group:steelplate", "" },
+			{ "", "group:steelplate", ""},
+		}
+})