[ Jeff Mason wrote in 160504 MMDigest:

> I acquired a 1920 Weber Duo-Art grand piano.  It is in remarkably
> good condition, however the pump thumps when playing.  I dropped it
> from the piano and have found dry, worn bearings.

Vibe Bearings may have the bearing for a Duo-Art pump.  I have never
measured one but I buy bearings from them for other projects.

Don Teach
Shreveport, Louisiana