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You can adjust the pressure on them so that the rivets float - I've made that mistake a bunch of times - but if the rivet is floating then the blade and scales can float around too. I guess if you...

The rivet squeezers also expand the outer diameter of the rivet shaft so that the rivet expands to the hole diameter and locks the rivet in place. That would work fine for the wedge end, but not so...

I've seen a computer controlled header before that could the job, but it had a ridiculous price tag on it. It might just be cheaper to have a human do it.