[rotorwrench]

The Lincoln Mercury O/H Manual shows the tools that they used to measure the pinion depth. The OEM R&P sets had the numbers scribed on to use with the calibration chart for set up. This made it a lot easier to set them up correctly with minimal adjustmants. Unfortunately, most of this stuff and the Manzel 4020B tooling is near unobtainium now so a person has to do it the by guess or by golly method of trial and error.