1. In a rotary coupler assembly including a yoke having an upper and a lower strap connected to a head portion, said head portion having a forward opening therein, a front follower between said upper and lower straps, resilient means to force said front follower toward said forward opening, a coupler having a butt portion engaged within said head portion of said yoke, a top portion on said butt facing said upper strap when said coupler is in its normal operative position and a shank projecting outwardly through said forward opening, corresponding forward spherical surfaces on said butt and within said head portion of said yoke in mating engagement, a concave and convex surface on the front of said front follower and the rear of said butt, the concave and convex surfaces being in mating engagement, the improvement comprising split means for retaining said butt within said yoke, a spherical surface on the top portion of said butt, and a cylindrical-shaped retaining surface on the upper strap of said yoke in mating engagement with said spherical surface on the top portion of said butt when said coupler is in a normal operative position, whereby said spherical surface and said retaining surface in cooperation with said other engaging surfaces and said resilient means resist drooping of said coupler when said coupler iS in its normal operative position.

8. A rotary coupler assembly comprising a yoke having an upper and a lower strap connected to a head portion, a front follower intermediate said upper and lower straps, a coupler having a butt portion intermediate said straps, surfaces on the front of said butt and within said head portion of said yoke in mating engagement, surfaces on the rear of said butt and the front of said front follower in mating engagement, means to force said front follower into engagement with the rear of said butt, and stops on said upper and lower straps to limit forward movement of said upper and lower front follower when the yoke if forced rearward from its normal operative position.