Look, I have been under the hood of cars for 16 years. I dont understand your views on the "one tooth off". The drive gear from the cam rotates the distributor shaft, which contains a locked in positional rotor and metal notched ring. The ring passes though the hall effect sensor which makes and breaks the signal to the module. The rotor travels around telling each cylinder when to fire. If the shaft is off in relationship to the #1 plug wire and the sensor is supposed to be in its correct position, you have a misfiring. The spark will not fire at the right interval in relationship to the wire and the position of the cylinder. In other words #1 just fired off (electrically) but the piston was in the wrong spot (mechanically) The plastic spacer, and cap are notched so that they lock in at a position based in the casted tabs on the distributor. You have no choice but to have the rotor in a predestined position underneath the cap. If the rotor is off the firing is off. What would happen if you took YOUR distributor and pulled the thing up and moved the rotor 180 degrees the opposite direction? It would not run, and if it did even fire you would know something is seriously wrong. The reason you move your distributor is to align the spark from the cap to its sweet spot from the mechanically correct piston position. You can advance or retard based on the notches from the metal that passes through the hall effect switch. I understand that you can in theory place the distributor in backwards and face the harness to the rear, but you still have to have the rotor in the right spot. Yes you can even have it off a notch if your piston is relativly close to the 0 deg mark and even squeeze the distributor to its far corners and pull off 10degs (lots of stress on the wiring though). To make a long story short, the shaft is what is off, not the distributor itself. Is this better?