Outrunner motor balancing rings

If you purchased cheap motors for your multirotor, and find that they aren't as well balanced as you would like, you can add one of these rings. The rings are slightly eccentric to add weight to one side or the other. Rotate them on your motor until the vibration is minimum and lock in place using cyanoacrilate glue.
Two sizes are provided, one for 35mm (nom) motors and one for 28mm motors. Scale the pieces as necessary to provide a tight press fit on your motors.

If you need more or less weight, scale the rings in the "Z" dimension.

Finally, I have included two non-eccentric rings so that you can add them to the motors that don't need balancing. That way, all the motors will look the same.