I looked over a 3Rensho frameset at the request of a local rider. The seat tube experienced a clean break about 1/2" above the BB lug.
Somewhere along the way the break was brazed together. From what I was able to see it didnt look like the edges were proximated correctly. I told him it was toast and needed a new seat tube. As you could imagine the owner was disappointed to hear my opinion.
We briefly discussed sleeving but there's no way to get an internal sleeve down that far and I doubt he'd want to externally sleeve it. His other concern was the ability to find the same kind of tubing, I told him he's probably be stuck with something other than what it originaly had.
Any thoughts or comments? Any rough estimates on cost without paint?