Not the best video in the world but its what I found quickly.

Notice the guy placing the dolly from underneath and hitting it with a hammer from the topside.

Once again they are doing this to stretch the metal back out because welding and heat SHRINKS METAL!!!!!!!

http://www.youtube.com/watch#!v=WRqbdKZAzoU&feature=related


Currently working on custom metal and How to videos.

1949 and 1972 chevy trucks
70 chevelle SS455
Pictures of my work and projects
http://community.webshots.com/user/sevt_chevelle