The Stock piston had AOE problems, this caused the sector gear to chew a bit of the 2nd and 3rd tooth, this AOE problem also made the back end of the piston chip a little. From the looks of it, further damage is unlikely to occur. The piston pieces found its way into the stock motor, it can still cycle, but at the right moment, when the pieces are caught inside, either it locks up or it really " lags" the motor due to the friction.
Job took 30minutes.
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