I would suggest it is a failure of our little analog cult that there is not some central clearing house that could/would go over odd bits and parts and catalog them and make them available to those who really need a widget to finish rebuilding their fabulous olde film camera or whatever.
It looks like when I go to that great Photo Op in the Sky somebody will shovel out 75-plus analog cameras, Lord knows how many lenses, darkroom stuff and stuff in general by the carload. I've got 98 percent of a Nikkor 80-200 f2.8 zoom lens, for instance. But nobody in my family and friends would have a clue.