I have a soprano Favilla uke. About a month ago I replaced the original pegs, which were slipping, with Waverly's, recommended by a luthier. (To be clear, these are not "violin pegs"; rather, they are metal and pinch the top and bottom of the headstock for the friction to resist turning.) When I changed the pegs, I put on a new set of Aquila strings. I'm sure the strings have gone through their "stretching out" period by now.
I'm having trouble with the 2nd string (E). Sometimes when it's a tiny bit flat, I nudge it up - and when I let go it drops a half tone or more. I can see the peg turning.
I have cautiously tried tightening the screw, but I've heard it's easy to tighten it too much and cause some other sort of damage. To me it seems as if there's insufficient friction between the metal washers and the wood of the headstock. Any suggestions for how to solve this?