doug, the pressure from the pliers needs to be dead center of the mold with the tips of the jaws only, if it still rocks try a thinner wire hook, you might have to forget about the red ones. I have had gold and black chrome ones too that were extra fat in the wire because they had been double coated, one or two in a batch, they do the same thing. you need to put a thinner wire hook in there and see if it still rocks, that will tell us where the problem is, go to a size 4 hook. there are other possibilities for this problem but we gotta make sure it's not the hook first. the other causes could be that a pin is sticking out too far, which I doubt, or a ding or burr along the outside edge of a mold half caused by dropping it on a concrete floor, been there done that, but thats easily fixed. just remember you want the plier tips on the spot where the jighead is located in the mold. sometimes the outside edges of these molds is not totally flat like the center section is where the head cavity is, this is dure to the hand sanding method I use, if you put the pliers anywhere near the edge, as in clamping down on the edge with pressure, the mold halves will rock some, so the pliers must span the edge of the mold and only contact the center.