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Semi auto is controlled by the sector gear cam, cut-off lever, and the trigger sled.
The selector plate plays a role, but its mainly to break the contact between the sector gear cam and the cut-off lever.
As your sector gear rotates, the cam pushes down on the cut-off lever. This would in-turn push the opposite end of the cut-off lever upwards.
When the trigger sled is pushed forward by the pull of the trigger, it is in a position where the upwards motion of the cut-off lever would also push the sled upwards. This knocks it out of contact with the two trigger prongs. The sled spring would then pull the sled back in place.
Take it all apart and simulate it by rotating the sector gear. If your cut-off lever can't properly knock the trigger sled out of place, then you'll never get semi-auto.
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