Hi everyone, I've been following this thread with great interest for the last couple of weeks; it seems like a great place to get information and swap techniques for getting the best possible sharpening. Thanks to everyone that has taken place in the discussion; I've learned more about skates and sharpening in the last couple weeks than I ever knew previously. I've been looking pretty seriously at getting a full size machine in order to start a (VERY) small scale sharpening business that will go who-knows-where, and I've got a couple of questions. I apologize if they've already been answered, as I haven't had time to review the thread in its entirety. 1. What kind of training, if any, does Blackstone provide when you purchase one of their machines? 2. Where should I be looking for used machines? 3. How long does it take to "get the hang" of sharpening? Are the difficulties related to technique similar between ROH and FBV? 4. (Slightly off-topic) What resources are available for learning to apply a radius? Again, apologies if this has already been covered, and thanks for any info you guys can provide me!