I noticed my pump had stopped on my bubble king skimmer so I took it apart and noticed this.
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If I put the impeller back in after cleaning it works but the pictures are after cleaning with a vinegar bath. I assume that was rust that you see in the pictures it doesn't come off. Do I need to replace the whole pump or just the rotor? Also the rotor spins fine and I don't see anything particular wrong with it but are you supposed to be able to move the black plastic shield that goes between the needle and the magnet as it has some play to move it back and forth.