[ Ref. 180415 MMDigest & https://youtu.be/9JoOEeH2fVg ]

Excellent to read about your restoration-in-progress.  I own an
Orchestrelle Model W, from 1899, which has been working for years.

I'm sure that you are aware that Richard Vance wrote a guide to
restoration of a Model W, which is available from the MMD, and found
on page: https://www.mmdigest.com/Tech/AeoW 

There are enough similarities between the W and the Y to answer most
of your questions, and make restoration possible.

These are beautiful instruments -- I'm glad to see another one
restored!

Bob Loesch