I bought an Endless Breeze fan. I read the reviews and the most common gripe is that it vibrates due to imbalance. I imagine the fan blade mold was designed and the first one came out a little out of balance and they just said, "meh. Close enough". On high, it would vibrate enough to walk slowly across my bench. I built a balancing jig with a couple of carpenter's squares to form 2 level rails and a nail with a plastic spacer on it as an axle. It worked pretty well to find the heavy spot. After a little balancing and trial and error I got this.... A couple of sharpie marks left over from testing and a washer for a #8 screw held in place by a little household "Amazing Goop". Now it runs smoothly with zero vibration. The motor makes a very little whining sound that isn't very noticeable and I don't find it objectionable. The low/med/high switch uses 2 coils of wire as resistors for the lower 2 levels. This just dissipates power as heat. Probably not very efficient. I may, if I feel like tinkering, build a PWM type speed controller. Just for goofs.