"Spring back" on hand screw clamps

[Al Utri]

What causes the Jorgensen hand screw clamp to not hold complete pressure when tightened? Could it be dried glue in the threads or worn threads in the barrel nut?

[glenn bradley]

I had this happen when I had accidentally gotten some lubricating-type solvents onto the threads. A toothbrush and some alcohol on the threads cleaned things up and got me back my grip.

[Mel Fulks]

Yep. Spraying brake cleaner on the threads works,too. Those things, for some reason, just don't tolerate any lube.