Jack,
I could never figure out how a guy could go to cutting on high dollar tires. And after I have read of some of the values of the Bonneville tires.....WOW. Currently, I have all my Bonneville project tires protected as well as some of the documents in the Library of Congress. I would never have the courage to either "re groove" with a grooving iron or use a siping tool.
Besides, my wife won't let me near the carving knives, anyway.
Regards to All,
HB2