Rings are sorted, coming from JP Pistons, odd thing with the crankshaft bearings. I have another motor for spares which I stripped down, found that the two cranks use different bearing sizes.

One crank has a 20mm I.D. Bearing either end but the one used on the Ogden mower has a 17mm on the blade end and a 20 mm on the magneto end. Wonder why they went to using a different size bearing on the stressed up end of things. Perhaps this is the reason for the fancy clutch ? Above the blade plate as the crank is thinner down there.