[pfreivald]

We want to make a C-shaped 'claw' that has no moving parts except for rollers on the end that will 'suck in' and 'spit out' the trackballs -- so we need something nice and grippy on the rollers.

We've tried a variety of materials -- 3M Aluminum Oxide 320 grit circles actually grip pretty well, but I think they'd have to be replaced often, and might, just might, violate the rules because they are technically an 'abrasive'...

Of the four brands of non-slip matting at the local hardware store, none grip effectively.

Patrick