Back home, I'd had a particularly bright flash of brilliance. For some of the construction, I needed some fender washers. I went to the store, and the guy said "Fender washers? Sure! They are 11 cents each." I thought about it for a few moments, thanked him, and left. Back home, I had a whole box of pennies and I had a drill press. Within a few minutes, I had a whole box of fender washers for 1 cent each.