Does anyone know of a video of how to use this? There's a few parts of the instructions that confuse me. It says to "establish a reference surface on the prop hub faceplate and Zero it, cross level the Cube, record angle, press Zero to zero it" What is cross leveling? What angle am I supposed to record? I understand most of the set up. I measure the angle from 4" from the tip, I use a 6' level to get blade height from the floor the same for each blade. I have a Seninch prop indexed to about 3.5 on the marks..my angles are about 15 degrees for each blade, within the 1/2 degree tolerance...I could not find a U Tube on its use. I C/W with the hub inspection, and marked the hub so as to return the pitch to where it was oringinally but I want to be as accurate as possible....