Some Things are Cheaper to Buy New than to Replace:
Many people may not want to hear this, but it's true. Once a critical part on an old, classic bicycle breaks it may take a few months of combing through eBay to get an exact replacement. A lot of the tools for working on older bicycles are also becoming obsolete. It may finally be time to retire that cottered crank bicycle project with the swiss bottom bracket and the Campagnolo Cambio Corsa shifting you've been working on and just hang it on the wall for the sake of art.