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If you have materials to make new pins and washers for the razor, file the head of the pins off before trying to drill them. If you are fortunate, the pin will drop out of the other side. if not...

I have used a "Magic /Eraser /Sponge" and some of milady's fingernail buffs to good advantage when dealing with bone or the high priced stuff. Just for the really grubby stuff or a final buffing....