"Q: "How can I fix a ceiling fan that wobbles?"
A: Turn the fan off at the breaker and check to see if it's securely attached to the ceiling. If the fan feels loose, tighten the supporting screws at the ceiling, and see if the ceiling box itself needs reinforcement. Next, make sure the screws that attach the blades to the blade mounts and the mounts to the fan motor are tight. If the fan still wobbles, check the blade alignment by holding a tape measure or yardstick against the ceiling even with the end of the blade; rotate the fan by hand to see if each blade measures the same distance. If one of the blades is off, you might be able to slightly bend the metal blade mount to align it, but don't apply too much pressure. If the fan still isn't running smoothly, the blades are either warped and need to be replaced, or they are out of balance. Balancing kits -- which include weights, a testing clip, and detailed instructions -- are available at home centers.