Brian, I just started doing the bodywork on the suburban fenders. I am using a Martin set and a friction disk from Sunchaser tools with success. Ken with Sunchaser says that I should prep my dollies and hammers by shaping them with a grinder/sander. What is your opinion on this? He provides a tape that shows the process and states that that the tools from the factory are not properly curved and need to be resurfaced smooth. Have you used a shrinking disk? Do you have any pointers? Thanks