I appreciate your lathe intentions Bucky... I deliberately ignored that concept as I don't turn bowls for which I can see it being useful.

However with my recent experience with vacuum systems (Fe$tool VAC-SYS and Grabo) for holding wood, I'm very interested in smaller holding capacity.

I often sand small pieces on an upside down clamped ROS and since my dodgy left arm incident, holding onto small pieces nearly always culminates with me crawling on the floor trying to find that bloody IFO's (Identified Flying Objects).
A small diameter vacuum cup could be of assistance.

At least this thread started to make me read (UGH!) on the topic and make inquiries. 

If your first cut is too short... Take the second cut from the longer end... LBD