Does anybody know what I mean? One of those windmill things that is supposed to go round when you "blow right"? (Yes, I know, a very poor explanation.) I tried googling it and got lots of sites that told me about flute windmills to cut wood with which obviously isn't what I meant. So I'd really like to know two things:-
1 What is it actually called?
2 Is it any good?
Would love some feedback. My flute is languishing in its case.