PhilD,
One could manufacture a nut approx. 3-4 inches long, that would function as the original nut. Then at the same time it could be counter bored to fit over the casted part about 2-3 inches. That would strengthen it big time...I'm not sure about the inner one, haven't really looked at it.
Worst part of it is; for everything you strengthen something else is gonna give out...
LC
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