"The gearbox part will probably be in great condition - just need cleaning and fresh grease/ gear oil."
Dead right. Are you sure it doesn't work? These things very rarely fail. 99% of apparent failures are due to poor adjustment of the selector cable. I have personally never known one go wrong internally, and I have one built in 1920 (definitely not SA's finest hour) and it still just purrs. As far as I know it has never been apart.
"The gearbox part will probably be in great condition - just need cleaning and fresh grease/ gear oil."
Dead right. Are you sure it doesn't work? These things very rarely fail. 99% of apparent failures are due to poor adjustment of the selector cable. I have personally never known one go wrong internally, and I have one built in 1920 (definitely not SA's finest hour) and it still just purrs. As far as I know it has never been apart.