On 7/31/2010 2:49 PM, a wrote:

The early Mooneys had a vacuum operated wing leveler, don't know if it
was required for airworthiness. It could be disabled with a button on
the yoke, that was handy when turning, the wing leveler really
stiffened the controls. Wing levelers, manual gear retraction,
manually pumped down flaps -- those Mooney Rangers were fun to fly.

I bought a pilots manual for the C-150 off eBay the other day.
It was in fact, a digitized scan of a manual.
So it could not be cut to size and stapled like the original. Ah well...
Anyway, one of the options (apparently) was a pneumatic wing leveler
driven by the pump.

I never ever saw one with trhat fitted.

Brian W