As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BLADE PRELOAD ADJUSTMENT SCREW FAILED AT JAM NUT ALLOWING THE NUT TO FLOAT FREELY WITHIN THE HUB. PILOT REPORTED OCCASIONAL STICKING OF THE PROPELLER. THE CONDITION WAS CAUSED BY THE JAM NUT HANGING BETWEEN THE HUB AND THE BETA PICK-UP PLATE. THE RESULTING DAMAGE TO THE HUB WAS CAUSE FOR RETIREMENT OF THE HUB. (X)