After you've set the PAP location by whatever method you like best the pin can be located anywhere on an arc centered on the PAP and with radius of the length of the line from the PAP to the pin. Let's say the PAP is 4 1/2" from the pin. Use your compass to draw an arc centered on the PAP with radius of 4 1/2". The pin can be located anywhere on that arc. It makes no difference whether you use the height above the midline or the distance from the vertical axis line to specify the location, the layout ends up the same. The grip center and mb (or cg, or mb to pin to PAP angle) will all rotate as you change the pin location on the arc. Try it on a ball and it will become obvious, it's easier to see than to explain. -- JohnP