Long time ago friend gave me some small balls made of Delrin . 1/8 inch diamater they drop in the lock screw hole on loading dies. Keeps the screw from damaging threads. Normally you would use a piece of brass rod, the Delrin is easier to use on very small lock screws.

Years later I use Delrin for a lot of things. It’s machinable plastic very tough. Had to order some 1 3/4 inch Rod from McMaster Carr to bush worn steering linkage in a couple of work boats. While on McMasters site noticed they sell Delrin balls. Added some to the order 1/8 inch $ 2.40 per 100

Usefull things to have on hand. Have replaced the brass slugs on my Lathe dials with it, tightens up nice no dial slipping. Am told they often used in food service machines as ball bearings.

Anyhow thought I would pass along the source .

Boats

Sounds like the perfect solution to clamping.  Thanks!  David

The Delrin has a really nice feel under a Lathes dial set screw too. Sort of spongy when you finger tighten yet have never had one slip.

Tighten down with a Allen wrench nut stays locked not turned frequently piece of lead shot may be better.  

McMaster has balls and all sorts of plastic shapes in many materials some fairly hard to find like PEEK. They are a great supplier for any shop supplies. Fair prices fast shippers web site very easy to use .

Boats