Thanks
bjrogg, I just put a bevel with pressure enough to be below center, grind it, then seat the 3/8" copper rod to take a heavy flake while supporting the piece on thick soft leather and nock fire out of the rod real close to the rock. The heavy flakes traveled to the far edge almost and just cut right under the high spots.
I lost most of the width trying to straighten out a curve in the blade.