Made spacers from some scrap steel to drill the seat belt anchors. Drilled one anchor in wrong spot and ordered repacement from Van's. Drilled remaining anchors correctly and marked the 2 diameter radius for reference in future trimming to avoid rivets/bolts. Used the step drill to open tolling holes and make 5/8 inch holes for snap rings to support wiring and rudder cables. Deburred holes and finished with scotchbrite.