LEGO Parts: Technic, Pin: 4274, 61184, 6558, 32138, 87082 1/2 3/4 3L etc CHOOSE

87082 Technic, Pin 3L with Friction Ridges Lengthwise and Center Pin Hole. 32138 Technic, Pin Double with Axle Hole. 61184 Technic, Pin 1/2 with 2L Bar Extension (Flick Missile). 4274 Technic, Pin 1/2.

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