Ours sounded like it was stuffed full of marbles and jacks and pencils and Polly Pocket pieces and legos, so Jack took ours apart and now it sounds like we have our own personal bulldozer (5x louder sound, but smooth and grumbling).
Like Jack says though - at least it works again. Some night at midnight when I'm done with my basic chores, and right after my to-do list including the vacuuming of cobwebs out from under my bed, I will add "take apart vacuum again and re-examine it". That's where ours is at on the priority list at the moment.
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Yeah MOPS! Yeah moms! Way to go! Give your kid a snuggle today!