They are interesting and have a lot of history behind them,I've always been fascinated by them and decided to start making them.There are a few videos on YouTube but not a lot of info on making them other than what you find on YouTube.I just decided to do it,took a guess on wheels size after compairing profiles on my favorite razors.I like the looks of the Big smiling blades but found the 5/8 and 6/8 round nose blades were the easiest to shave with.The swept back points and square points always seem to Nick me around the ear no matter how careful I shave.My practice blades are 1/8 inch at the spine but I'm going to actually be using 3/16 .I found that for myself that once you get up to 1/4 inch and beyond its like trying to shave with a hatchet.