Scot Tremblay wrote:For period instruments I'm not particularly fond of them as I think a properly fit tradition peg is actually better for a number of reasons but I fully understand why both luthiers and players would want to use them.
Agree. Friction pegs work very well on classical guitars... much better than they do on violins/cellos, IME. But I can understand wanting a little finer control too, in which case planetary gear pegs should be perfect. I rather dislike standard machines with rollers. Pain to get the strings into the slots, and the gear ratios are too high... takes forever to wind up a new string.
I have some of the 9mm pegheds which I'll be using on a harp guitar. They're pretty large, but still fairly light weight. They have a tighter mechanism than the smaller types, so I'd probably go with them on classical guitars as well.
I used some of the Knilling violin pegs (not sure if they're identical to 7mm pegheds or not) on a steel string harp ukulele. They work well, but do have a slightly loose feel to them. Not sure if it would be very noticeable on nylon strings though. Steels on 4:1 feel about like nylon on 1:1... or maybe even more sensitive. But even so, I can tune easily and accurately with them, so you should be fine with any size. 9mm might just feel a little better.