One of JAM's design engineers needed a new bolt pin for his Autococker, but didn't have any on hand. He conjured up this simple pin design in the machine shop, and ended up with a pin whose only consumable part is an inexpensive, buna o-ring. No more plungers, ball-bearings, or retaining pins to worry about, the Universal Pull Pin uses the expanded o-ring to hold the bolt pin in place. Pins are available in black anodized or nickel-plated aluminum and black or white delrin. Two o-ring sizes are included for tight and loose tolerance back blocks.
The JAM Enterprises Universal Pull Pin is older, so while it may be available used and in a few cases new, it is not commonly available anymore.