User talk:Gmm5136

Why can't you use a plastic washer?

You cannot use a plastic washer to replace a metal one. The properties of the washer would decrease drastically, and if was used for tightening a metal nut, it would dig right into the washer. There could be applications for a plastic washer, but it looked as if they copied a metal washer, for prototyping purposes of a metal washer.