Here's an "exploded" pic-
The order, from right/top to left/bottom- threaded aluminum post, 1/2" sealing washer (rubber washer bonded to concave steel washer), blade, sealing washer, washer, 8-32 screw. All parts available at Home Depot, and Lowes. Probably elsewhere too.
The sealing washers are a perfect fit for the AFCK opening hole. The rubber portion press-fits into the hole, but the metal portion is too big to pass through.
The aluminum threaded posts are sold individually and come in a variety of lengths. The one I used is 1/8th" long (a longer one can always be filed down).
I had to cut away some of the rubber inside the sealing washer on the side of the blade opposite the screw in order for the post to fit through the washer.
In regards to the threaded posts, the ones sold at Home Depot have thick edges around the head, but the ones sold at Lowes have tapered edges giving them a smoother, lower profile (at least those are the ones they sold the last time I was there). I used one from Lowes.
I was very happy with how easily it all went together and how well the stud performed. It was much easier to operate than the hole, especially with gloves on. That was my experience anyways.