Here's the website for Pegheds:
http://www.pegheds.com/
Peghed planetary gear tuners
I first heard about them from a friend of mine who builds both classical guitar and historical instruments like baroque guitar. He swears by them on his baroque and early music instruments.
Their main market is the classical field, but people who play other instruments that traditionally use friction pegs - like mountain dulcimers, old time banjos, flamenco guitars and, yes, ukuleles - are using them in increasing numbers, as well.
But for classical string players in particular, Peghed tuners are a major game-changer right now.
whm