There is nothing wrong with the diff screw, nut or spring, but if the diff keeps backing off, you either got them in wrong way round or the nut and screw needs replacing (they sell them in packs you know). Only thing you have to watch, is which way up the thrust washer goes, as one side is rounded and the other is square, the rounded side goes facing the screw head.
I have run this type of diff for 2 1/2 years no problems.
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