I do the 4-40 screw in the needel like Gremlin said but take it one step more. I use A fired 22 case and drill A hole in that too and screw it down with the 4-40 screw. Then when the engine is running it just makes it easy to get the ball wrench into the screw head and stays there.
Once my four strokes are broken in and set I never have to touch them unless I go to A different size prop. If it's cold enough to have to adjust them then I'm not flying that day!!!