This is not a re-crown on the cheap. I purchased a muzzle crown /chamfer kit from Brownells. I had to get some additional pilots (to cover my other guns). Instructions are clear. You can do it slowly by hand or by a cordless drill with the adapter. I tried by hand at first. Found I was not keeping a consistent 'down' pressure and could only go part way around the 360* of the muzzle. Opted to change to the drill w/adapter. Don't use TOO MUCH down pressure and go rather slowly. Use cutting oil. Lap the 'bore' to chamfer the ends of the lands. They sell a brass tool for this too, or you can make one or use a brass screw (round head variety). Oh, you'll need some lapping compound for this part. Does a good job. I come into old guns from time to time and this is one of tricks (along with fire lapping) I use to get an old gun to shooting good groups again. But, as you can see, you can tie up some money in tooling.
I'd say use an electric screwdriver vs. electric drill: electric drills usually don't turn less than about 2k rpm, and even the variable speed triggers go from off - barely turning - top rpms in about this -> <- much space. Power screwdrivers typically turn slower & have smaller [weaker] motors so the user doesn't have problems w/ stripping all their screw heads. Should work aces for this application, I would think!
The Dewalt rechargable drill I use has good trigger speed control and 3 speed ranges that would help keep the lapping under control.
Your right 30calpal, a lot of money can be tied up in tools. Some folks call em "toys", especially when someone else pays for them.
If it's too easy, You're doing it wrong.
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