As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAIL WHEEL RUBBER SEPARATED FROM METAL WHEEL AFTER THE FIFTH LANDING. THIS IS THE SECOND OCCURRENCE IN A MONTH. THE SIDEWALL THICKNESS WAS UNDER .0312 INCH. THIS IS WHERE THE SEPARATION STARTED. THE TAIL WHEEL QUALITY FROM THE MANUFACTURER HAS BEEN POOR FOR THE LAST SIX MONTHS. MFG HAS BEEN CONTACTED AND IS WORKING ON A SOLUTION.