There is a hole through all the arms and the housing just below the shifter handle under the car, about 3/16" or so. To adjust the shifter put the trans in neutral and loosen the adjusters at the shifter. Slide the pin in, use the biggest drill bit, solid rod, or screwdriver that will fit in the center hole. Adjust the arms so they are all in neutral when "pinned". Put the shifter in each gear, one at a time, and adjust the overshift stop bolts so that you do not break the shifter forks in the trans by overshifting.