Hi Henrik..I think the rubber feet only serve to isolate the motor noise from being an annoyance..ie..hum or rumble..if the old one was making a noise when turning its the armature shifting in the bushings/bearings and binding with the coil..the right course of action was to change it as mine went down hill very quick from this point onwards. i"m sure the rubber grommets get stiff over time due to changes in temperature but dont have a bearing on the normal operation of the motor function to the best of my knowledge..Good job done Henrik...hj.
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