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Generally thrust washers are 1/4 or bigger outside dia. and yes they go between the scales and tang. This is so you can tighten the scales down and still let the razor move under a desired tension....

Nice flair to it. Makes my wrist hurt looking at the amount of sanding you did :<0) I didn't see any thrust washers. If your blade is tight then your handling should be easiest.

Lots of old...