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Swapped my cassette in about five minutes with this, and the guide pin kept it from slipping off the lockring the way my old tool did. Solid engagement on the Centerlock rotor too.

The 5mm guide pin seats perfectly in the quick-release axle and keeps the tool from slipping off the lockring when I'm torquing it down. Pulled my cassette in under a minute, no knuckle scrapes.

Snapped onto the cassette lockring without slipping, and the 5mm guide pin sat perfectly inside the quick-release axle so it stayed lined up the whole time. Used it on a Centerlock rotor too and it grabbed fine.