This title may surprise some of you, coming from me as it is with my constant emphasis on learning to grind freehand. And I still think freehand is the best way to do large blades, and the only way to do certain complex historical grinds. Folders, however, are another story. They have to be precise, and it's darned near impossible to grind folder blades while holding them in hand, since they have extremely short tangs and get too hot to hold very fast.
I was bumbling along with a