use 3m 5200, glue those fockers on, screw in place. babaysit as glue ozes out with many many wrags. keep the seams clean as the glue oozes out, itll look better when finished. thats how 99.9% of tubbies I have seen have een put on, and ive seen hundreds. remove the screws after its all dry, and fill with 5200. it looks trick too.