You know the half tooth piston body is meant for helical gears only, eh? All other gears require the full toothed piston. (Not sure if torque up gears use the full or half in all honesty.)
Make sure your piston head is seated properly in the piston body, and sort out why the piston is pushed back so far. My experience I've found some piston bodies to be a millimeter or two longer than other pistons, which leads to rapid teeth shredding, so you might have to buy another type of piston body to make it work well.
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