I am trying to mount the the gimbal housing to the transom. It uses a cork gasket not rubber. I have had this thing on and off 5 times but the top of the gasket will not stay in place. When I go to tighten it up it wants to slide in. I glued it to the housing but still moved. Any one ever done one and have some ideas so that it will not move when I try to tighten it down.