Accident Sequence
The pilot reported losing directional control after landing. The airplane veered off the runway to the right and came to rest on its nose. The pilot noted a left crosswind of about 10 knots.
Damage
The lower rudder hinge point had separated from the vertical tail post. The steerable tail wheel is attached to the rudder horns near that hinge.
Findings
The failure of the lower rudder hinge point resulted in the loss of both rudder control and tail wheel steering. This led to the pilot's inability to maintain directional control during the landing roll.
Probable Cause
The probable cause is the failure of the lower rudder hinge point, which caused the loss of rudder control and tail wheel steering, preventing the pilot from maintaining directional control.