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I was told that this was a forum for serious collectors / restorers of vacuum cleaners, obviously not.
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It is. But as I'm sure you'll find elsewhere, many collectors / restorers also like to USE their finished projects, not have them sat gathering dust (or not, as it were) not doing anything.
Using your example, what the heck is the point of restoring a vintage radio for it then not to be used? Also bear in mind that the example you've given has no moving parts and in use is not particularly "interactive", for lack of a better word.
What's the point of collecting something, fixing it up and restoring it if you're not going to use it? That's the fine line between collecting and hoarding.
People discuss ALL aspects of vacuum cleaners on this site - from repair and restoration of vintage machines to the use and performance of modern machines, to the history of a brand and how cleaners have evolved over time. It's inclusive of everyone's interests and if you don't find a particular thread or topic interesting, the simple solution is to not comment on that thread, but input on other area's of collecting that do interest you. There has to be an element of diversity and inclusion, right?
Incidentally, I've been a part of the vacuum collecting/enthusiast scene for 10 years now and never found anyone who doesn't actually enjoy using their restored cleaners.
There's 2000 members on this forum, so clearly we're doing something right.