Sorry for bumping up such an old thread, but I just did this mod and I'm getting alot of hum especially with the series switch engaged. I am positive that I did the mods correctly except I'm concerned about the grounding. I think I've formed a ground loop somewhere but I don't know where. The other mods on this guitar are two switches to activate the neck or bridge pup in parallel and a killswitch. Can anyone help me out? Thx