i tap the restrictor port 1/8-27 NPT deep enough to use a recessed hex [allen wrench] pipe plug that goes slightly below the valve body mating surface. i then drill various holes in the plug or plugs to tailor the overlap to my liking. easy to unscrew the plug to change or drill the hole larger. can even be done with trans in the car, as the hole is just slightly larger than the hole size needed for the tap, and a shop vac takes care of the few chips remaining [if any] after tapping with grease applied to the tap. reminder, you don't need [or want] to crank the plug macho/mucho tight. it can't go anywhere with the valve body installed. no sealer needed as well.