buckyball

Floridians concerned with the coastal humidity festival and rusting steel in plaster might use thinnest stainless sheet scrap in the same way. I haven't looked, but I can bet ss specialty washers aren't available, two days late, or are a quarter each plus shipping and handing. Pan head ss washers are probably too heavy for easy cold forging, although if one uses a flat head, it might be, ah, self-countersinking. One can also use a stainless pan head/small washer to over-tighten sheet into the die, which avoids carbon steel transfer to the stainless, probably an over-analysis. However, consider the effect of the steel hammer on the galvanized layer as shown, usually very thin on the plumbing strap aside from the raw edges. I note "self-depressing" above, also the comment about rust "pops." Good tip for those of us with chaotic garages who "work in" a lot of stuff in multiple locations. (It takes a few years to season inland newcomers, and even if they care there often are no good solutions, so these rust/corrosion problems do come up from time to time.)