Yes, although not a banjo player, I did work with Bill Keith many years ago and know that.

If you read the posts by BobL and Bee-Dubya-Ell you will see that they ask two questions which I think I've answered. (Other banjo tuning pegs are available).
For guitars you might like to investigate these - https://hipshotproducts.com/products/gt1-guitar-xtender