Hi,
As I am only trying to get it working to dig my plot, and not for a museum piece, I don't want to spend much more on it. So I will stick to the existing piston, and try to get 1 or 2 rings.
I have attached 2x images of the piston, looking through the exhaust port, where you can just see the top of the piston and the top of the first ring. To me it looks fairly good. The second photo is of the worst score on the piston.
I'm sure that once the vital ingredients are applied it will work. Now I have to test the plug or buy a new one.
Cheers, Camerart. Image 2 to follow.