You can also use the Armadillo to lay out a ball for drilling, let's say for a 5" x 4" layout. Line up the 5" line on the Armadillo with the pin and rotate the Armadillo around, holding the 5" line on the pin until the cg (or mb) falls on the 4" line. The PAP for the layout will be at the axis finder on the Armadillo. Then use your normal method for finding the grip center, the center line and the midline. -- JohnP