Quote:
Originally posted by gmat
Your impeller shaft may be damaged or warped. If you try the pump *alone* in a basin it should be totally silent. If not then it's damaged.
Now if it's silent you're good for glueing the impeller.
The little rubber cap wont come off easily, just make sure that:
* You dont lose it
* You dont bend the shaft while pulling hard
Thats all 
Tell us if it went well.
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Ok, got it apart, was just a little stubborn.
I also ran the pump under water and I can only hear a hum, no rattle, so I guess no damaged parts.
After removing the impeller from the shaft of the magnet I noticed the Eheim has splines to keep the impeller from rotating independently from the shaft, except for a very tiny bit.
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.
Anyway, you guys recommend I glue the impeller to the shaft to prevent rattle so I will get it done. Noise is not desirable!
Jim