I would NEVER file the frame groove wider on a S&W. Never mind a vintage collectable!! What happens if it goes out of time again?? Will youi go to a 2X oversize?? Nope.... I fit the hand to the existing frame slot which calls for thinning the hand. Tell me you can do that in 30 minutes!!
At this point,to me the timing on a Python is child's play.
The file is for thinning the oversize hand so it fits the slot and put a thin groove on top of the hand like the original so the lock up of the cylinder extractor star is bank vault like. Where did you read that I would file the slotted frame groove?


















































