If it started when a rag wrapped around the spindle mandrel? You may have damaged the mandrel. Check where they bolts onto the deck, if the mounts are damaged, this could give you the vibration. You could also have done something as simple as bent a blade.
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You could remove each of the blades and check to see that each one is "balanced.". One unbalanced blade can lead to the problem you are having. While you have the blades off, you may want to sharpen them, balance them, and then try reinstalling them. That will also allow you to inspect the area on the madrell where the rag wrapped around the blade.
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