> They call it a "beater bar", apparently. These's a little switch to 
> deactivate it. (It's actually just a lever that pulls the drive belt tight 
> or slack.)

Yep, it's the bit that gets all the hairs tangled around it making it hard 
to turn ;-)  On mine the beater bar is powered by the air-flow, because it's 
at the end of the pipe.

> The laws of thermodynamics seem to suggest this wouldn't work too well...

Use a balloon stretched over the exhaust pipe then :-)

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