I am with bkervaski. The photos make it look as if the dimple (die) is too big in diameter. The witness marks from riveting I have seen before, but the final rivets and the dimple don't look right to me. The band around the rivet indicates a dimpled surface, but the rivet should fill the dimple completely. I would definitely try a second set of dies for comparison. Photos can be deceiving, I know, but that looks like more than a few microns.
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Last edited by bk1bennett : 08-23-2017 at 04:30 PM.