In 100810 MMDigest Jos Peperstraete asked about Herophon arm and discs.
There is an address in Europe with which I have already worked for the
restoration of my Herophon, specialized on Herophon, Ariston, etc.
It is

  Drehorgelbau Blüml
  Alois Blüml
  Achentalstr. 11
  D-83224 Grassau
  Tel: +49 8641 1457
  Fax: +49 8641 598964
  http://www.drehorgelwerkstatt.de/ 

Mr. Blüml is a very capable man and who can also get discs.

Good luck and best regards,
Jean-Marc Cerutti
Geneva, Switzerland