I use all three, a farriers rasp, a #50, and a #49, whenever needed. All three, along with my Torges file, Bowyers Edge, Veritas Scraper, and Boogs Spokeshave, are always within reach whenever working a selbow. I should restate that, the #50 was always alongside the others until it disappeared at the MT Selfbow Jamboree last spring. Been looking to replace it but haven’t found a good used one yet. The reviews on the new Nicholson rasps are not very good, thinking I might end up going with one of the Aurious from Lie-Nielsen. I love their catalog, my wife once said I need to give her all my credit cards and wear a bib to catch the drool whenever I look at it.