"TheAndroid" wrote in message
oups.com...
It's a collar with three or four screws with locknuts perpendicular and
pointing in. The screws are used to hold and center odd shaped work
(like rectangular) pieces for use with the steady rest. The collar
rotates in the steady and the item turns with it.

Andy


Good explanation. I didn't know what it was either. "Cathead biscuits" is
as close as I could come.

Garrett Fulton