I was recently contacted to do some repair work on a vintage "Vittorio Strada". Unfortunately the bike had not been correctly stored by one of its previous owners and some rust holes had developed through the chain stays.
Typically with a custom lugged frame the lugs and tubes are put together with silver, as the tolerances are much higher. However with a more production oriented frame the tolerances are a little "slacker" and silver is not an option so brass is then used (also brass is 1/10th of the price). Unfortunately with this bike the builder decided to use brass, meaning I am going to have a far harder time removing the chainstays due to the higher melting point of brass than safety silver.
The first part of this process was placing the frame in my jig and set the jig up so it fits the existing frame. This was done so that once the stays are removed I can then put the new ones in and keep the same frame dimensions that the bike previously had.
Once the jig was set up for the frame I removed the chainstay brace as well as cut out sections of the drive side chainstay. With the drive side chainstays cut into segments I then started removing the stay from the lug. Now due to the high temperature that brass requires it was not possible to evenly heat up the bottom bracket lug enough to remove the chainstay in one piece.
My next step is going to be slowly cutting up the chainstay in pieces inside the lug and heating them up individually to remove them.