Originally Posted by Walt
The stop flange was incorrectly installed as can be seen in the video and confirmed by the OP, this can cause the upper retainer bolt to shear with the resulting nose gear collapse.
Just to amplify what Walt has said - if the flange is incorrectly installed, every single time one does a tight turn while moving the plane or taxiing, the nose wheel is prevented from pivoting far enough by the flange. This causes a large torque to be transmitted up the gear leg, which can only be resolved by the mounting bolt.
A properly installed flange will allow the nose wheel to pivot far enough so that the airplane can be turned with one main gear not moving.