I've got some Hipshot Ultralites to fit to a P bass.
The Hipshot bushing is a bit loose in the headstock hole. The Fender one is tight.
The Fender bushing is just a push in item and the actual machine head is held in by 4 wood screws on the rear of the headstock.
The Hipshot bushing has a screw thread and bolts to the machine head holding it in the hole. There is only 1 screw on the UL to stop it rotating in the hole..
I could use the Fender bushing with the UL machine head but they would not screw together meaning that it would only be held in place by a single 5mm wood screw, so I'm assuming that is not secure enough.
The inner diameter of the bushing appears to be similar, but the UL bushing is thinner - a smaller outer diameter, hence the movement.
Is there any harm in the full Hipshot set up being able to shift in the hole a little if I make sure the tuner is butting up to the side that will bear the tension when the bass is strung up? So it won't actually move in use as it will already be up against the wood properly.
Any ideas?