I wish my lovely single F horn had one of those nifty levers - I'm always having to turn the dang thing upside down in the middle of a performance, and twist it till the "water" comes out.
AAAAAAAAAAAAAAAARRRRRRRRRRGGGGGGGGGGHHHHHHHHHHHH!

I need a double.

I shouldn't be insulting my instrument. (I've just had a terrible rehearsal and had to leave early. I should be insulting my conductor, but here's not the place for that...)