I opened up the closer on my Yuasa Speeder this morning for the first time
and found this. I think the guy I bought it from might have mentioned this,
but I don't recall. The broken part looks similar to an AccuraFlex collet.
I have some larger ones for one of my collet chucks. It doesn't look
exactly the same (size not withstanding) though.

Anybody know what collet that is? Is it a Yuasa only part?

It still works to clamp the collet/holder that actually holds the end mill,
but it would be nice to have one that isn't broken.

Picture Files:
http://www.yumabassman.com/collets/

Smaller Picture Files:
http://www.yumabassman.com/collets/Forum%20Size/