I saw that picture also. It's hard to tell exactly when it occurred. It could be a rebound from the torque reaction to the housing,..A shock issue maybe? I would guess its related to the pinion snubber setup. They weren't commonly used on stick shift cars. The shortness of the contact could be causing a violent reaction , even with the front spring half beefed up like it is. The Stahl Jr Stock single bar system was to the right of the pinion and a good deal longer.