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Exsessive vibration is normally attributable to the mower deck. If the vibration is occurring while the blades are engaged and cutting this would indicate a need for further investigation. Check the blades for damage or uneven ware. If the blades are new or appear in good shape check the mandrals and shafts to ensure they are not Brocken or bent. You can get mandrel assembly's for around $60.00 online and replace all you need in one go.
Bad vibrations when engaging blades is usually caused by an out of balance blade. Out of balance blades occur due to damaged and/or bent blades. The fix is to find and replace the offending blade.
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.
Check that the blade securing bolt is secure. While you're there, have somone SLOWLY pull the starter rope. It will be obvious if anything is bent to the extent you describe.
If this machine has a blade clutch, engage blades while you do the pull test (DISCONNECT PLUG WIRE!!!!)
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