What’s the purpose of the elongated plastic thing on the left side of the connector in this picture?
Similar question except this connector has the elongated plastic bit on the right. What is the purpose of the plastic bit with the ridges?
Both those pieces snap off and then are inserted after the cables are pushed through to secure the cables and prevent them from pulling out. The top one slides into the rectangular slot just above it in the picture. The lower one slides into the slot in the middle of the connector. They both lock in place after being pushed in against the cable so don't push them in before the cable is inserted.