What was found
(CAN) PILOT REPORTED A SHIMMY AT THE END OF THE TAKEOFF ROLE. INVESTIGATION FOUND THE RETAINER RING IN THE PISTON, INSTALLED WITH A TWIST ALLOWING THE O-RING TO NOT SEAL PROPERLY.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(CAN) PILOT REPORTED A SHIMMY AT THE END OF THE TAKEOFF ROLE. INVESTIGATION FOUND THE RETAINER RING IN THE PISTON, INSTALLED WITH A TWIST ALLOWING THE O-RING TO NOT SEAL PROPERLY.