In most cases, when a cassette won't turn to lock together is it because the steel portion of the cassette is not fully seated onto the XD driver. We want to make sure the fit between the cassette and XD drive is snug, so make sure you are greasing the inner diameter of the cassette and pressing firmly to seat the steel portion. The locking mechanism will not require a lot of force, so if you are having to strain to lock the two pieces together, it is likely because the steel portion is not flush against the aluminum portion.
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