Vibrationsabsorber M4 4 St. Graupner 6853.4 These vibration absorbers can be used in any location where the model has to be isolated from vibration. This reduces the strain on the model caused by vibration, and also reduces sound transmission by the airframe. To mount an absorber a single hole of appropriate diameter has to be drilled, e.g. in the nose bulkhead insert the vibration absorber until the flange rests against the surface, then screw the motor mount in place. The fixing screw should always be secured with a drop of UHU thread-lock fluid.