I’ve spent many hours watching your videos when I first wanted to make razors. But it was an extremely slow start and I’ve forgotten most of what I watched. Going back through them now. I do have yet another question. How much if any difference in thickness do you allow before heat treat?. I practice on scrap I have lying around to get my skills up and I’ve got about .2mm difference from the heel to toe. I don’t have the luxury of variable speed on my grinder at the moment and on final passes I just turn it off and use it as it slows down and repeat until I feel it’s done or I overhear and throw it out.