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those aren't hard and fast numbers. Those just happen to be some of the scrap metal that I have in the shop. You can definitely go a bit up or down for either washer thickness.

26 gauge is .016 in. and 20 gauge is .032 in.

use the thinnest sheet for the inside washers and thicker for the outside. I tend to use 26gauge nickel for my inside washers, and 20 gauge for my outside washers.

Awesome idea Mack! I hand cut my first set, but I guarente that I won't be cutting my second *grin*