Gunner wrote in
:

My Foredom has a tiny Jacobs chuck in the handpiece.
Took me forever finding a chuck key, and one day I found about 200 of
them in Reliable Tools for a buck a pop. I bought 4..just in case G


I've got a couple of Dremel 3-jaw chucks.

The "funny" thing is that the won't work well on my older flex shaft but
will on my newer one.

FWIW, the latest "top-of-the-line" Dremel kit includes a planer and a saw
that are both powered by the mototool.