I have this tenor guitar tuned GDAE that I really like, except for the tuners. They feel really rough, and there are spots where they just want to jump over a pitch. The worst example is the G string tuner, where it gets really hard to tune just before coming to pitch, and then jumps up to a g-sharpish pitch. The others do that to a lesser extent, but the troublesome spot is not right where I want to be to be in tune. It does not *seem* to be a nut slot problem to me, as it doesn't have that characteristic "ping" when it jumps up over a pitch, and it just feels different. Rough.
I will try to add pictures, but these are tuners with a small screw on the outside to adjust the tension, but that doesn't solve the problem. There is no obvious way to lubricate the innards, but I haven't taken them off the guitar.
Any suggestions on adjusting these or whether I should order replacements? Thanks for any advice.
Here are some pictures; this is a no-name guitar and the tuners are not original.
Front of the headstock:
Back of the headstock:
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