The cassette lockrings don't have as much thread either so can fuck up when you try and tighten them.
Especially the alu one, so easy to strip if ham fisted.
slightly off-topic: Disc lockrings and Cassette lockrings are different, yes? Different thread size? I have never found one that would fit both places.
@edscoble started
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The cassette lockrings don't have as much thread either so can fuck up when you try and tighten them.