Cracks in a case, yeah.

Cracks in a thread, I wouldn't even attempt. The only way I know to fix threads involves grinding out the crack, refilling with appropriate high strength suitable patch . . . and then re-tapping the threads.

Nope, wouldn't even think about attempting it on a customer piece of equip -- odds are, it wouldn't be completely satisfactory and the customer would be ill (because he paid me) or I'd be (because he didn't).

Sorry.

PoolDoc.