In the event I had exactly the right number of left and right feathers, down to the last one; but needed more to make repairs after the ball.
I started 2 years ago, but had to abandon the project. At the top I bent the feathers so that they would cover the plate and spars nicely, see second photo, taken from above.
The finished ends of the tube are shown in picture 2. I did this by sitting down on a chair and measuring the distance from the chair to a point about 2 inches above my shoulder. The first picture shows the front of the backplate where you can see how I trimmed the feathers to cover the joint between the wing and the backplate.
The hairdresser gave me an Elvis trim and back-combed my hair for me. Dividing 3 by 9 gives a ratio of 0. Some of the feathers need to be glued along one edge only to allow overlap and movement. They are great for sleeping, swimming, surfing, as PPE or whenever you need a good pair of ear plugs.
You can use a Dremel but make sure you wear your PPE ear plugs; you don't want noise induced hearing loss. With the pliers wind one end around the top of the ring once then glue the other end securely to the top-side of the shorter spar see picture 1.
Measure the depth of the bony leading edge from the picture you are using as reference. Again, refer to the wing you are copying. This bit took a couple of goes to get it right. This very hing somewhat extends when it's..
Finally, i've bought a batch of nandheld feather fans from China and just took the feathers off - turned out to be cheaper than buying feathers separately: This requires some attention to detail.
Lets start with the hinge. In the end, wings are folded when held up and automatically and very gracefully unfolded when i barely touch them to spread them.