When I looked at the video it does not show where the guy is measuring from when squaring the frame. It shows the center point under the motor, but not the point on the frame rails. In looking at the diagram you posted I can't see that point in the diagram clearly either. Would love to get that supplement e-mailed. Any help would be appreciated. Buckeyebird said he would e-mail it to me, but I did not get it. Hope he looks at this tread and tries again, My e-mail address was wrong in my profile -- oops ---- Thanks