the part of the sector gear that has no teeth should be "up" (so no teeth have engaged the piston). Also on the face of the gear is a peg that pulls the tappet plate back once a revolution.(once for every smooth part on the sector gear). A triangle part of the plastic tappet plate is contacted by the "peg". A common new mistake is to have that peg under the plastic triangle part. It should be positioned so it's about to contact it- when you reassemble the mech box
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