Serrated edges and slot in locknut. I think I could do it if I sanded the nut 2-4mm and sanded all the edges. But again, there's no guarantee I'm doing this accurately enough to ensure even pressure on the gasket. From what I've learned, if you're working with water and don't want it to leak, you need to make sure everything fits within the tightest of tolerances. I wouldn't trust that part.
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