Combining drills?

[Your Computer]

Why are there if statements out of a function? Look at Amnesia's inventory.hps; see how everything is structured, where things are called at. Of course your item combine callbacks aren't being registered. Try to figure out the reason and purpose for why things are written the way they are in Amnesia's inventory.hps. Also, you shouldn't be trying to add item combine callbacks when the player has retrieved 3 parts of one item. You should instead be verifying whether or not the player has those 3 items at the time a combination is attempted.