Originally Posted by geeknerd99

One of the coolest things I've seen for dent repair was for musical instruments. Depending on the size of the tube that the dent was in (whether it be a flute headjoint or the bell of a tuba), there were different sized stainless steel balls. You dropped the ball into wherever the dent was located, and then used this super powerful magnet the size of a PBR tallboy to pull on the ball (that was on the other side of the dent), and you kinda rolled the dent back out from the inside.

Granted, I'm not sure how well this would work on bike tubes, as flutes and brass instruments tend to be a little on the softer side.