Fitting and installing the spiner has proven to be a bit more of a task than I anticipated. Not that anything was particularly difficult, just tedious and slow careful work so as to avoid making the cutouts for the three prop blades too large. There is no redo on too large a cutout, just a reorder new spinner and start again.

The first step is fitting the two support plates in the spinner, squaring them up with each other and the spinner itself. The distance between the two plates must be exactly the same as the thickness of the prop hub. The Catto prop hub is 1/8″ thinner than this measured distance. Solution is: order a 1/8″ spacer plate from Vans to make the overall thickness equal 4.5″ . As an interim solution, I made 6 spacer washers from aluminum plate so I could continue with this task.

Next a cardboard template is made that provides the shape of the blade at the point where the spinner is attached. This shape is traced onto the spinner exactly 120 degrees apart and then cutout using the usual collection of fiberglass tools. Once cut out and fine tuned, a hole filler plate is made of 063 aluminum which is riveted to the spinner back plate.

The final step is drilling pilot holes around the perimeter of both spinner mounting plates thru the spinner (in assembly) and then removing and installing approx 24 nutplates.

Pictures to follow.