great idea Tom! brass plug. That will help some. I will have to think on the “readjust” the swat makes once you tighten the screw..it does move a bit to make it flat..I think maybe that can be overcome by pushing on the swat the right way while holding it and holding the stone to the swat..I will have to tinker with that.
I do see where Iwaller is coming from. I agree with Tcmeyer it works just fine. But could it be better suited for the upgrade arms.. yes.
I think there could be a change of them that would work better for both styles of arms rather then perfectly working (the stones align up with the full paddle) for the old arms and sorta working (paddles only partially align up) for the new arms.