if you have a drill press - or can firmly mount a drill - get the part straight in the chuck and remove material with a fine file, the polish with paper - not too much pressure on a small part - you may cant it in the chuck. go very slowly and measure often.
you may need to anneal it and then retemper -
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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