The metal barb holds the plastic in place behind the head; the Mustad UltraPoint 1/0 hook ensures the point is immediately available when setting the hook. Choose a body length that matches the shank so as not to stiffen the entire tail.
A slow retrieve allows you to take advantage of the rig’s ability to stay on the bottom. If the rig drifts too quickly, move up to the next weight among 3.5, 5.25, and 7 g. The color does not affect the rig’s mechanics; it primarily helps maintain a visually consistent appearance.