The old way, still good, is a piece of thin steel with a 90 degree bend, about 1/2 inch each way...Bolted under one of the crankcase bolts at the bottom of the engine.Put a bell crank on the the other end and a Du Bro ball on the carb and another on the bell crank...Connect with a 2-56 threaded rod...You can drill(carefully) a #50 hole in the metal piece on the carb shaft to tap for the ball....