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That is a good question and one I never worried about. I guess it would depend on how much or how little the washer stretches during doming. I'd guess they may shrink a bit in diameter. Flat washers...

This is just a guess. If you use a flat washer when you do your pinning that still puts most of the pressure on the edges of the hole in the scales. I believe domed washers would transfer more...

When you buy washers they are flat. You have to make them into domes yourself. There are several ways to do this. If you type in "making domed washers" in the search box in the upper right corner you...