My brother has kindly lent me, on a long term basis, his MIM Fender Jazz. He rarely plays it (he's mostly a guitarist) and knows I will give it a good home. It sorely needs a set-up. Probably new strings, too, but that's another matter. I've got my feeler gauges, Phillips & flat drivers, ruler, and capo, but I'm stumped on the Allen wrench I need to adjust the bridge, and the one for the truss rod. What sizes are they? None of mine fit. TIA! Edit: Mods, this ought to be in Hardware, Setup & Repair.... Sorry.