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They usually come with a balance kit. If you don't have it anymore you could probably buy one at a store that sells the fans. Mine came with something that looked like a clothes pin and some sheets of lead with an adhesive side. You would put the clothes pin on each blade and run the fan to see if it smoothes out. When you find the right blade you move the clothes pin thingy to different places on the blade to find the perfect location for the weight. Then you would stick a weight on that spot on the blade to balance it. I assume the weight and the clothes pin thingy weigh the same.
Since yours was fine a month ago maybe one of the blades needs tightend up or the weight fell off. Check that first.
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