So I have this NES Zapper that I picked up from a thrift store that didn't have the cord (I'm guessing the previous owner wanted a toy gun and cut it off ). Anyhow, I have a broken NES controller that I salvaged the cable/plug off of to use with the Zapper. However, the wires for the Zapper are connected to different pins inside the plug then what the controller used. So I need to get inside the plug to rearrange the wires, but the only problem is I can't figure out how to open the plug. I noticed there are 4 small holes with what I are assuming to be tabs. I tried pushing them in but I still can't get it open. What would I need to do in order to get inside the plug?