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My money is on piston getting stuck on rails.
I don't possibly see how AoE is corrected without removing a second tooth. It's just impossible. That being said, notice how there's very little damage to the second tooth?
In this scenario, the sector would try to pull back the pick-up. It would jam into the second tooth, slip, and attempt the entire pullback process.
Piston makes it almost to the end before it gets stuck. The gears power through it all. Notice how the front is stressed to hell.
Piston is released but gets stuck or slows at the very same position.
The sector gear is coming around again for a second pull-back. Instead of engaging at the at the first tooth, it starts pulling back somewhere at the position of the shredded teeth. Cycle repeats.
This would have been super evident with a chrony. If you're doing gun doc work, get one.
TL;DR: Piston gets stuck. Hectic somehow short strokes his system.
John
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