slide topper bracket

Does anyone know the procedure to pin the slide topper so it will not unroll or unspool. I am getting water in and its from around the bracket that holds the topper. I was told to remove the bracket and pump silicone caulk in each mounting hole and around the bracket. I tried using the small squeeze tube of silicone, but the self tapping screws are deep an only 3/16 I think (typical RV self tapping)& I need to get the bracket off to go directly into the hole. There are 5 selftapping screws in the bracket. I only need to do one side, so I don't need to remove the topper, just the bracket on one side.
I know they are spring loaded and you only get one pass at this to safely pin the topper from unrolling. If you are not right, you have a big mess. Something I don' want....