Modify prop hub/cowl spacer, recess center area 5/32" per DWG, using fly cutter and sanding drum in drill press. Install prop drive lugs into prop hub flange. Drill 6 holes in prop hub spacer and mount spacer to prop hub flange.
Recessing Center Area of Prop Hub to Fit Prop Hub Flange #4014
Recessing Center Area of Prop Hub to Fit Prop Hub Flange #4015
Center Area of Prop Hub Recessed to Fit Prop Hub Flange #4017
