Tool can be used with rubber stop in place, First roughly place quadrant into outer case & hook the spring onto quadrant, then insert tool and turn until it hits the stop(2nd photo) then turn tool clockwise until you clear the stop rubber in outer case then just push quadrant into outer case. 1st photo shows how to use tool to remove quadrant, same thing insert tool till it catches the return spring the turn clockwise and wiggle out quadrant once clear of stop on outer casing.I made this tool as I got fed up with fiddling around trying to get return spring into place this tool makes it so easy and is worth the 1/2 hour of time to make....