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The inside of the frames are normally pretty rough. I use a hand slot stone to deburr the hand slot. Stone away any burrs were you have metal to metal contact.
Polishing well sometimes round off corners, that's not always a good thing. The sear notch and sear needs to have sharp clean edges.
A hand slot stone, a sear stone and a surface plate with 1kgrit paper should do all the work needed.
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