I just had my 70s Bertin repaired, it had a dent in the top tube. J** B***** made tools which go into the head tube and the seat tube, and allow the top tube to be filled with grease or oil from a grease gun, as the pressure increases the dent pops out.
chris ioakimedes
UCLA
> In a message dated 12/5/2003 5:59:20 PM Eastern Standard Time,
> mail@woodworkingboy.com writes:
> What about making up two wooden blocks each the shape of half the tube
> diameter, putting in some hard rubber padding, and then clamping the blocks
> over the dent to push it out?
> That will still scratch the paint. If it is tight enough to force out the
> dent when clamped, it will be tight enough to squish the paint too. In my
> limited experience, those blocks reduce the dent, but don't eliminate it. It
> usually requires some filling and sanding to get it right. Perhaps someone else
> has
> a better method. I know someone once told me that if you freeze the spot
> with liquid nitrogen that the dent will pop out, but I can't see that happening
> without also cracking the paint--plus, I don't happen to have liquid nitrogen
> around the house. Lou Deeter, Orlanod FL