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In the article by Unaclocker "Magdrive Impeller Silencing", he mentions pumps where impellers can rotate as much as 3/4 a turn from the shaft (magnet) freely. Can't imagine the Eheim being able to do that with the splines that index the impeller onto the shaft.
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Mine could rotate slightly. This changes from one pump to another, but all those aquarium pumps have this security (so gravel / solid objects can go through without damaging the shaft).