I'm sorry but unless you only ever work on the same guitar with a radius that is bang on with your block this cannot work. A board can sometimes have a radius that has very slight changes over the whole board. A block gives you very little control and can only ever level frets that conform EXACTLY! Maybe it works for you but I would never even consider this method. Anyone who is buying stuff from stewmac is mental I do have a few bits (yes radius blocks, files etc) which I got when I was new to this and knew no better. I soon realised that they are a bunch of old gits who will relabel any old sh*t, create a job for it and sell it for 10 times its worth. This is all light hearted banter by the way. I am in no way dissing your methods. Whatever work s for you. I will jump out of this one now. I've said my piece and it's getting a bit silly. Fret leveling is a simple business and no matter how you go about it the end goal is the same. To remove any high spots without doing any needless damage to your frets. Laters. Jon