There are two generations of Phase 3 tuners. I have fully disassembled, reassembled, and service both types.
1) First Gen - Relatively short-lived, has a simple aluminum collar. Tensioning requires a jig to squeeze the collar onto the shaft, then tensions the button screw.
2) Second Gen - The most common type. Identifiable by the hexagonal collar and @2mm of exposed tuner shaft between button and collar. The collar is threaded. You can adjust the tension by loosening/tightening the threaded collar. No jig is required. Loosen the grub screw on the collar, then adjust by hand to the desired tension, then tighten the grub screw on the collar. Be VERY careful to use the correct size hex key...failure to do so WILL strip the grub screw. You want a 0.9mm hex key...I prefer the screwdriver-type hex key because it allows finer adjustment than a simple L-shaped key. (Some will say to use the 0.035" hex...that is 0.89mm...Gotoh makes these tuners, so it is metric...they built to 0.9mm - it is the exact fit, you can feel play with the 0.035" hex).
Assuming you have the 2nd-Gen...check the following:
1) Remove the tuner (leave the bushing in the headstock)
2) Check the brass tuner post for and play
- If there is play, tighten the black screw in the brass gear
3) If no play in the tuner post, check for play in the button shaft
- If there is play in the button shaft, follow instructions above to tighten the collar
- Tighten to taste...tip - it helps to keep the button on the shaft, you can hold the collar, then turn the button to dial-in the tension...it's the best way to get a proper feel before tightening the grub screw in the lock collar
If you have to lube anything, use white lithium grease - that what Gotoh uses.
Any questions, let me know. I have plenty of photos of the disassembled tuners that might help orient you.
Good Luck!