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Opposedtwin..cant do pm’s yet…here is what I did for my adjustable water throttle deal on my ’76 9.9/15…
Pulled head and outer cover on head. Removed thermostat. Made aluminum washer with 1/4 hole in center to go where the thermo was. Beveled outer edge of washer to hold an o-ring tight when cover is installed. Temporarily assemble outer cover, washer and oring. Turn head over and look at thermo hole. Insert 1/4 drill bit through washer hole to mark back of outer cover. Drill tap hole and tap 1/4×20 in outer cover. Take 1/4×20 stainless slotted screw and thread it into inside of outer cover. By turning screw in and out it covers the hole to various openings. Use nut on outside to hold setting. There is not a lot of room so the screw will be short. If I were to do again I would use a 3/16 hole in washer. Use a slotted screw so one can’t turn off the water fully.