I'm no expert, but it appears to me the center pivot arm limb pockets pivot at the C clip axle through the arm itself. Not at the pockets. Mine were looser than I cared for when rec'd it. I tightened them down, but didn't crank on them hard. More like good & snug figuring cranking them down too hard could either strip the screw or crack the pocket. But if this is the case, then Bowtech does need to let their customers know this.