Quality control Checklist

Make sure that P18 and P19 overlap by 1"

Make sure that P18 and P19 are centered with respect to one another

Make sure that at least about 1/2" of cutting knife is exposed after grinding

Make sure that P15 is oriented with the side closest the holes on the side farthest away from the teeth

Make sure that the angle between the long leading edge of P15 and P18 is 90 degrees i.e. those teeth are pointing straight outwards.