All LTDs are 4mm? The one from my AW-7 didn't fit. I've adjusted plenty of truss rods myself and have no problem doing it, but this 8-string seems to have too much buzzing in the lower frets and I think I need to loosen it just a tiny bit; though, the action seems to be fine. Maybe I will just take it in to my local guitar shop and see what he can do. Thanks.