The 3 degrees doesn't have to be exact. I used 2 washers behind the left side of the mount (2 on top and 2 on bottom). It's close to 3 degrees. I offset the mount to the left so that the prop shaft exits in the middle of the cowling. My thrust angle seems to be right on now. It doesn't pull either way in a vertical line. If you do it that way you don't need to offset the cowl. Just put it on in it's normal location.