I was wandering around Harbor Freight the other day and I spotted what I believe is the nearly perfect bench block for gun work, knocking out pins, and such. Rigid, but non marring, large enough to span an auto slide or frame, several recesses to catch pins and screws in---
Behold, the $7.00 rubber wheel chock!
Tim
Behold, the $7.00 rubber wheel chock!

Tim