My usual very slow pace is going along as usual, had some fruitful research on the legendary Ron Kirn leveling thread out there in internet land, a small discussion with our guy henderman and appreciated his input. Between my son and I we have quite a few partscasters and cheapies and will be doing some fret work. In the past, I have done light leveling and then crowned using a triangular file but it's a time consuming method and is not at all fool proof. Since I may be doing quite a few necks, I need a crowning tool to speed up the process. What reasonably priced tool can I purchase to crown frets?