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I want to mount my antenna on the gunwhale near the stern as recommended in my owners manual and have purchased the heavy duty stainless Shakespear rathchet mount which is fairly heavy. I will be using lag screws but am not sure if there is any plywood or anything beneath the glass to support the lags? My concern is with the weight of the mount the fiberglass might not have the strength to hold the bouncing & weight of the mount and the four foot Galaxy antenna. Thanks.