I pull all the spark plugs first, then the distributor cap, install Thexton. Since I tapped the end of the crank with a retaining bolt, it is easy to rotate the crank and adjust the intake and exhaust of the same cylinder when the rotor is pointing right on the cylinder firing order on the Thexton.
Shade tree trick- - - - -if you can find a bottle of "white-out" that's not dried up, put a dab on the distributor housing by each spark plug wire tower- - - -it does the same thing as that Thexton tool, at no cost. A sharpie mark works, for those of you too young to remember what white-out was used for!
After the blond secretary finished using the computer, there used to be white-out all over the monitor screen!
LOL!
Jerry