Thanks again Grumpy, the diagram was very helpful.
All the gearing looked OK.
130ml of gear oil was the deeper dished half filled to the brim.
I didn't notice the marks to align on the selector shafts when I pulled it apart, so they are lined up now.
I have it all back together and it all turns freely with no meshing.
I have reassembled the base.
I cant order the engine parts I want until the new year, so I will service the carby and starter and then this mower will be awaiting parts.
