Hi Gatty7 and DJ,
I shall check up with a good supplier I have but I'm not expecting a good outcome. I've never seen such a badly worn Series 1 adjuster. I'm thinking of how to retrofit a Series 2 unit on while still retaining the chain case mounting bracket as the series 2 machines have the chain case screws vertically affixed to the chassis and not horizontally to brackets. I'll have to have a good look at both machines that I have here and see if this can be easily done without too much mucking around.
Cheers,
BB