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If you soak in Neat’s-foot oil, submerge in a Ziploc bag for a couple days, before you unpin it will revive them and make less brittle.

Un-pin with a pin vice or Dremel with a tiny carbide ball...

Nice scales, the shield should be inlayed. It is a bit of work with a drill press and cleaned up by hand, with a parser drill or router, make sure it is centered.

Grind and Polish your pins with a...