This anti-vibration kit can be used to reduce vibrations in a cooled astronomy camera that can cause image degradation if the fan is unbalanced. It's tested with ZWO cameras but may work with others.
This kit contains:
4 x Anti-Vibration Fan Mounts
4 x Silicone O-Rings
HERE is a video covering how to install the kit. The red silicone O-rings are installed between the round fan wire brackets for the screws holding the fan and the camera back plate.
Alternately, replacement ZWO fans can be found HERE