Grab the current hand piece in one hand and the end of the shaft
in the other and you can pull the hand piece off. Sounds like the
Badeco is the one to get- buy it once, have it for the rest of
your jewelry career.
Inside the hand piece the rotary motion from the shaft is
converted to a reciprocating action which is adjustable.
Personally I use a hand held pusher that I made to set most of my
bezel set stones. Occasionally I resort to a hammer and chasing
punch. The hammer hand piece that I use has a pointed tip for
stippling glued in with thread loc.
Richard D. Hamilton
Fabricated 14k, 18k, and platinum Jewelry
wax carving, modelmaking, jewelry photography