I recently started looking at an old Peavey unity series I never got set up properly, late 80's or early 90's I think, and the action is set too high. When I lowered the bridge saddles I got alot of fret buzz and sort of a note cutoff on the higher frets and that won't do, so I'm thinking a truss rod adjustment might be in order. None of my tools are able to turn the rod though. It looks like the size allen wrench I need is somewhere between 3 and 4 but even the wrenches I have that are close don't even grab it. This is my first truss rod adjustment so forgive my ignorance but I just wanted to see if anyone had done one for a bass like this and knew exactly what tools I need. Thanks.