If I remember correctly, the hook hangs quite a way over the edge of the mold, and as it hangs over, pulls the wire insert along with the hook out of the cavity. It also depends on what size hook you are using in what cavity. If this is your dilemma, than you can do 2 things to solve this problem. #1, You can lightly tape the hook shank to the mold half, and that will hold it temporarily until you close your mold to pour. #2, Make a small aluminum ledge onto one mold half, to keeep the hook from doing this. Make the aluminum angle or a ledge for the hook to sit on, and then drill/screw it into the bottom of the mold half or countersink a screw into the face below the cavity. I hope this makes sense. I will post a pic when I get home tonight.