pharmaboy
Eats Squid
Hate to say it but have to ask. Over torqued when fitted? It looks like a few of the teeth on the lock ring have snapped off, though could have happened when the cassette failed.
Will agree with the rest though, warranty claim if you can, these things are bloody expensive!!!
Lock ring snapped off by lbs - likely cause, not removing the spacer for a 142mm hub and the tool doesn't engage enough - anyways, unrelated to failure.
Ctguru - something over 5000km according to strava