Got a wobbling fan?
Stop the fan and tip it with your hand. Don’t hit the ceiling.
Move it slowly and watch as it rocks and settles down. The high side needs a balance weight.
As suggested by the title, I stuck a quarter up there with a double sided tape pad from the junk drawer.
Adjust / repeat as necessary.
* may also work with a penny, dime, two quarters— your mileage may vary. Probably won’t work on “hugger” style low profile fans as easily as you can’t tilt them – just try the weight on each blade until you see the best improvement then fine tune by moving it in and out on the blade.