As with most folks, I started with a Foredom #30 handpiece. But
I soon discovered that most bits/burrs came in one of two shaft
sizes. They are three "spins" apart on my #30 handpiece wrench.
I eventually bought a #10(?)D (D is for duplex, as in it has a
spring) quick change handpiece. A really sweet upgrade, but it
only handles the smaller shaft bits (3/32?). Not as "broadly
functional" as the #30!
I also bought the AllSet deal from Rio. Fits on the #30. I
keep the harness on the #30 handpiece, and use it when I use
various kinds of burrs. However, I have my most common Cratex
wheels and buffs on the proper mandrel to fit the quick-change
The #30 standard "jacob's chuck" will always suit a variety of
tools (custom and purchased), but the quick change handpieces
require the proper shaft diameter.
The quick-change (10D) is a luxury I could live without. I
could not function without my #30 handpiece! The ability to
chuck anything cylindrical is invaluable to an artisan!
I hope this helps,
Charlotte, NC (USA)