Originally Posted by Kogswell
Bike Tools Etc sells tubing blocks that are mostly used by framebuilders.
The description in the catalog also states that they can be used for removing dents:
http://tinyurl.com/96lcu
You could make a tubing block from wood. I did it with a drilll press and a band saw.
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.