I know we are talking fractions here, but would it be better if the tuner shaft makes direct contact with the surrounding wood of each hole in the headstock? I am replacing some tuners on an old Ibanez semi-hollow with some locking Grovers. The replacements will pop right in without the need to ream the hole. They're not swimming around in there, but not making positive contact either. I think that the bushing nut and single screw will keep things steady. Should I call it a day?