Heat shrink insulation heated with heat gun. I placed a small bead of caulk all the way around about 1/4\" inside the edge. I also placed a small bead around my new wire hole. I put the gasket over the well nuts. (I stretch the gasket around the well nut flange--if the hole was 1/32\" larger it would have been perfect:( [I took some finger nail clippers and trimmed the flang of the well nut my 1/32\"- it fit nicer] I put another small bead of caulk around the wire hole. I pushed the light wires into my wire hole until light was down on the gasket. I screwed the light down with 1\" 6-32 Truss head stainless screws. It has been sugested to put some anti seize on the threads before installing them.