I finished sanding the large oval hole. Next I setup a fence on my drill press to allow me to drill all of the 3/32 inch pilot hole in a straight line. I clamped a piece of hardwood to the drill press table 1/4 of an inch from the centerline of the drill bit. This lets me drill exactly 1/4 inch from the edge of the part. All I have to do is line up each of the marks measured from the end of the attache plate.