Hi - I've got the 1/4" and 1/2" collets for my milling machine, like:
http://www.lathes.co.uk/rockwellmillers/
that one, the Rockwell 21-100. Not sure how to specify the collets that
it takes, but I'm hoping someone here can "translate". I need a 3/8"
collet, there probably was/is one but the person I got it from wasn't
the most organized so I can't find it if it exists. Anyone have a
source for one, or have an extra to sell?

Thanks,
Dave Hinz