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.