Or rather, any suggestion on how to make sure the transducer mounting bracket does not leak through the holes I have drilled in the aluminum transom? I saturated the area with silicone caulk last year and it "mostly" worked. There was just a slight seepage in the area. I was thinking of some sort of backing plate on each side to allow a larger area for more goop, but figured maybe someone else already figured out a better way. Thanks.