05-25-2011, 08:36 AM
i had that problem on old f4i...i put a big "o ring" from a washtud/shower drain around the base (way thicker then the vortex one) then I took a grinder to the base where the pegs stick out where you would run your allen bolts down and took a little material off so the base would sit down and be a lil countersunk in tank...worked good!

