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@itsbruce
Cottered cranks are a particular problem, not least because almost nobody makes cotter pins any more. Not all vintage cranksets are cottered, because cotterless cranks first appeared on more expensive bikes and gradually became a standard. In most other areas of your bike, vintage parts are only a problem if they have rare/non-standard sizes. Really, though, you need to do the research on this, to learn. Pick a component, google it, see what other people have said about it. Plenty of info on this site if you use the search tool.