I like the theorys, and would like to try a few of the above methods. The whole problem with the theory of the repinch is you cannot take a perfect circle and compress it and expect it to be round. Where did the extra material go too?

I like the piston expansion idea. If the sleeve is tappered and you ran it until no more pinch, a fatter piston would work assuming that the sleeve has not worn to the point where it now has become a strait bore.

I beleive the caster oil theory, but assume the premix ratio is beyond normal, 16:1 maybe. If you have a nitro motor with little to no pinch left and drop a few drops of afterrun oil in the cylinder, it will start.

The last idea of putting an oil grove in the piston will probably work but I would assume have the shortest life out of all the fixxes mentioned above.

If you dont learn something new everyday, you waisting your time on this rock.