Thanks Larry, that's some nice work you did.
Talked to Bob at Avery today and he says it's used to dimple holes in situations where there is a large sheet requiring one person on one side of the sheet with the "block" and another person on the other side with a rivet gun. If possible could you give an example of a situation where your home made blocks helped you set a dimple.
Also, am I right in assuming the blocks are never used to set a rivet
Thanks,
Dave