Originally Posted by icithecat
But how do you get inside the tube to press it back out against the blocks?
With tig welding there are no holes into the tt and with lugs, the holes are about 1/4 inch.
its sort of like playdough in your hand, if you roll it between your two hands, it doesnt matter what shape it is in to begin with, it will eventually form a long round 'snake'. same basic premise with a metal thin walled shaped, if you bang a crooked tube from several different angles with these round blocks long enough you will get a round-crosssection tube. just like with auto body panels, you reshape the piece into what you want by banging on it, not by taking it apart flattening it, reshaping and then reattaching.