I am trying to identify the part number of a Cessna trim actuator. Externally it looks identical to the Cessna 100 series elevator trim actuators, however it's has a steel case and the end bearings are threaded into the case and secured with only one groove pin on each end. Internally it is much the same as the standard trim actuator, except it has a very thin roller bearing plate on each end. It is not a MacFarland replacement actuator. Any clues ????