Years ago in the '70's a brilliant friend of mine wanted to strip his Claud Butler frame for repainting. Took it to an engine rebuiler and had them tank it in the stuff they soak engine blocks in. They gave him back a bag full of tubes, lugs, drop outs, etc. Turns out that caustic engine cleaning solution disolves brazing material. BTW, he's the same dude who forgot he had his brand new, never riden, beautiful red Roberts on his VW roof rack. He remembered just as he drove into his garage. And then there was the time he didn't realize his shoe string was caught between the chain and chain wheel at the start of a criterium race. He owned a bike shop and bought a new pnematic frame holding fixture that clamped on the seat tube. Do you know how thin the seat tube on a super light English criterium bike is? Apparently he didn't either. Since he bought a slew of Roberts frames they took pity on him and replaced the tube for free. It never ended with that guy.