Rudy,
Thanks for the detailed reply. I did not think about having one edge hang over a elevated stone. I will give it a try. I believe you are right about the chisel losing it's temper. I was using it and a large chip came out of one of the cutting edges. I did not hit anything but wood so it appears to be in a brlttle state. By the time I have filed out the chip hopefully I will be back in metal that still has it's temper. Thanks again. Longbeard (Eric)