Made a quick trip to the hardware for a couple stainless screws for securing the light to the mount ring. I had to drill thru the fiberglass where the two mounting screws thread into the ring. This was done carefully with a small drill so the threads would not be damaged. I finished the drilling from the inside using a #40 long drill bit being careful not to hit the mount ring. This allowed the two screws to go all the way thru the ring and extend slightly into the tail cap. Makes a nice installation.