Thank you very much for your time and help with my problems. I have spent quite a long time operating the machine watching each part move and how it interacts with other levers.
There are a number of parts which appear to be not used and for some reason are not connected! I know you mentioned that perhaps in the dim and distant past it had been modified.
I have attached a photo to show the payout levers which appear to have been modified. There really is so much to learn, it reminded me of when I first got a Japanese Pachinko mechanical machine working.
All the best from Neale.