Greetings all,  Recently there was an inquiry about making or
installing the dampers on a Racca Melodica piano.  In my Internet
travels I came across a mechanical music museum in Cremona, Italy,
that has, among other interesting instruments, the same piano.
The website is https://www.museomusicalia.it/  and a picture of
Queen Margharita's Racca Melodica is at
https://www.museomusicalia.it/en/team/hall-of-the-queen-margherita/ 

I would suggest contacting the museum to see if they might be able
to assist in solving the mystery of damper installation.

Good luck!

John McClelland

 [ Also at https://www.facebook.com/pg/AmmiLab/posts/  -- Robbie