Wow, there's someone in Australia that might be able to do a retro fit?
You guys know more about what goes on down under than I do.
As far as I know, I'm the only one in Western Australia with an OB-SX. Not sure about the rest of the country. My service engineer said mine was the first OB-SX he'd fixed, and he's in his 60's now, having started with analogue in the early 70's. There's very little information about them on the web, apart from a few dedicated folk like yourselves. I've learned so much more about my own little OBie just spending a few days on this forum than I have in the last 6 years.
Thanks again for all the info, corrections and advice.