I am completing the restoration of an upright 36-note Ariston which
had been partly restored by someone else.  Unfortunately there is
no reservoir spring.

Does anyone have, or know of, another 36-note Ariston, either upright
or table-top model, from which I could get the reservoir spring
dimensions?  I believe Carl Semon in the US had one; does it still
exist?

Thanks,
John Farmer, UK