As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PART HAD APPROX 700.00 HOURS SINCE OVERHAUL, FATIGUE CRACK APPEARS TO HAVE ORIGINATED AT FORWARD BOLT HOLE. PROPELLER/ENGINE BEGAN VIBRATING IN FLIGHT DUE TO COUNTER WEIGHT SHIFTING ON FERRULE. AIRCRAFT REDUCED POWER, LANDED AND WAS REPAIRED BEFORE FURTHER FLIGHT. (K)