Replacement Damping Rubber Insert, Blue, for APM/Pixhawk Shock Absorber

The rubber insert inside a glass-fiber shock absorber mount is the part that actually does the vibration damping, and it's also the part that degrades first with age and flex cycling - long before the fiber plate itself needs replacing. This spare keeps a perfectly good shock absorber assembly in service by swapping just the worn rubber, a cheaper and faster fix than buying a whole new mount over one aged component.