Don't get confused here between the PA type speedo and the Chronometric type speedo. The two are very different indeed with the result that few Chronometric speedo restorers will touch a PA type. I, for one, can restore PA speedos - but I send my own Chronometrics away for restoration.
36 4G, 37 VH, 54 KH(A), 75 Healey 1000/4, 52/53 ex ISDT KHA (project).
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.