Re #13, Captn Zap.
You'd be surprised what a little "massaging" can do to smooth out the depression that frequently appears around a rivet.
Finish off by placing a rather heavy bucking bar behind the shop head and lightly striking the outside, centered on the rivet, of course, with a fresh (soft) rubber mallet. It raises the depression generated by the riveting.
Viola, smooth, riveted skins!
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Marc
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