Well Jack, according to me, as I facetiously indicated above, what the steel allen grub screw does is punch a hull in the front of your rudder. That's why you really want your " ... rudders (to) seat exactly in the housings without any need for the screws to be engaged." Are you using a 10 hole adjuster? What hole are you in? How much tiller tug (apparent weather helm) do you have?