Hello, I'm a aviation structural mechanic mainly been working with aluminum for the last 27 years. now finally doing some work on my own classic cars and looking to learn more about working steel and auto body techniques. I stumbled on to this page after looking at and purchasing the "Wolf" shrinking disk only to find out I should have probably shopped around first. I guess I bought from the company who copied the original and someone said they had issue with "Wolfes". Guess I'll just hope it all turns out alright