Shimming he hammer spring is worth it but effects cocking ease and trigger weight.
You could taper, round and polish the valve stem head, match up the piercing pins diameter to it also.
Polish the hammer and spring and lube lightly with a moly/oil mix, polish the inside of the main tube where the hammer travels.
Don't take too much metal off those surfaces you don't want room for the hammer to cant and bind.
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