As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) SEVERE VIBRATION WAS FELT ON TAKEOFF. AIRCRAFT RETURNED TO BASE. NOSE WHEEL REMOVED AND UNABLE TO BALANCE. UPON TIRE REMOVAL AN INTERNAL BALANCE PATCH WAS FOUND UNATTACHED. THIS TIRE WAS PURCHASED NEW IS A GOODYEAR P/N 301-392-641, S/N 91851436 WAS INSTALLED ON OCT 06/2000 AND HAD ACCUMULATED A TOTAL OF 460 LANDINGS. A NEW TIRE WAS MOUNTED BALANCED AND INSTALLED WITH NO VIBRATION NOTED ON THE NEXT FLIGHT.