I never said you could not trun it over. I said it would sqeak to a stop and then go past TDC with quite a bit of force. It only takes about 10-15 seconds with a Monokote Gun to loosen it up nice.
My highest time engine will still stick on TDC if it stopped there, and cooled off.
I would never think of loosening the machined fit, that is why they are as powerfull as they are. The cylinder is in perfect harmony when at operating temps.
There is no measureable amount of leak down with these engines.

Fox probaly used it because his maching was so lack luster and crude.