I just had this same problem only my tab was only cracked and not completely torn off. I was able to overlap the broken tab with some fiberglass mesh and brush the resin over it until it dried up. Once it dried it is holding real nice. If I were to do it again I would duct tape the mesh in place and then brush the resin over it - or grow a couple extra arms to hold everything in place. Then once dried cut the mesh along where the tape was.