Cut out spinner template and affixed it to spinner. Drew prop cutout outline 3/16" inside cut line to allow for sanding to shape. Found centerline by tracing around circumference on poster paper. Then measured diameter and set radius on compass. Drew several arcs of the radius to find the center of the circle. Drew centerline thru center point and used it to set opposite prop cutout. Unboxed prop for first time-- way cool! Installed prop in hub, snugged down hub. Temp set pitch to 17 deg to see how to use template. Fit spinner to check clearance. Still needs some sanding to final cutout dimensions.