I'm 4 years late with Thank You's. Both David Dewey and John Tuttle
provided suggestions to my December 2020 posting for help getting
notes to play in a Fischer Ampico grand:

https://www.mmdigest.com/archives/Digests/202012/2020.12.15.01.html 

A piano moving company moved this instrument to Ontario, Oregon,
and set it up. It worked for a few months then quit.

Michael White from Bellevue, Idaho, helped them find a loose flange
bolt in the vacuum system; the piano movers must have loosened it
thinking it was for the leg.

Tightening that bolt made the player work -- a simple fix! So glad
to see it making music again. Attaching his picture of that bolt.

Mike Lott - Pianos N Things Music LLC
Boise, Idaho
https://www.pianosnthings.com/ 
webpiano@aol.com.geentroep [ delete ".geentroep" to reply ]

 [ Ampico A flange bolt. The movers thought it was a leg bolt.
 [ https://www.mmdigest.com/Attachments/24/09/03/240903_214857_Ampico%20Flange%20Bolt.jfif