This reminds me of the Donald Duck cartoon in which for some reason some of the Duck family have acquired a steam calliope (kind of like a somewhat portable pip

This reminds me of the Donald Duck cartoon in which for some reason some of the Duck family have acquired a steam calliope (kind of like a somewhat portable pipe organ), and are trying to figure out what to do with it. Whereupon they meet a strange hermit who lives in a cave, or something, and who says that he has absolutely everything he needs in life, and there is nothing they can offer him that would be of any value. Except for one thing. Of course, it turns out to be a steam calliope. Similarly, I suppose that, sometimes, when you really need a helicopter rotor, you really need a helicopter rotor!