We now have the bearings required to rebuild the engine, so that at least, can go ahead. However, it appears now that the gearbox is in very poor condition. It desperately needs a set of planetary gears, and the man who is rebuilding the engine has exhausted his list of suppliers. The gearbox COULD go back together as it was, but how long it would last, and how noisy it would be would be anybody's guess. To my mind, that would not be a sensible thing to do.
If anyone out there knows where I might track down some gears, new or second hand, or even a complete gearbox, I'd be eternally grateful.
Also, I've been told that the gears from a 3G gearbox ( I think that's the one- the next size up from mine) could be used, after a bit of machining. Any thoughts?