I have salvaged a few of these from oil can jockeys.  This should be
a Standard Pneumatic Action wind motor.  Send me a picture and I might
be able to dig one out for a replacement.

I suspect I could degrease the thing, otherwise I'd replace the sliders
and motor facing.  Most of the time the only part that needs degreasing
is the arms and bushings.  Soaking those in degreaser works well so
far.  We have to rebush _all_ of them anyway, so soaking them is only
slightly longer than normal.

D.L. Bullock    St. Louis
www.thepianoworld.com