Originally Posted by
Chuckk
I've already picked up a tailpipe expander for seat tube dents.
It will probably take a little modification to make it slightly smaller, but should work.
Here's the Harbor Freight part
They have brake cylinder hones to clean up the inside of the tube as well.
Great idea about the exhaust pipe expander. Best used with those blocks, though, I imagine, to keep the tube from oversizing.