Drilled spinner
I worked on the spinner filler plates some more until the prop had 1/8″ clearance at coarse pitch. I made two small pieces of Al sheet to hold the filler plates in place per the plans, although I used .032 instead of .064. The thinner sheet is plenty sturdy enough.
I sanded the inside of the spinner a bit more where the front plate hits. The spinner is not absolutely perfect but it’s within 1/32″ of where I want it to be. I don’t want to reduce the structural integrity of the spinner by sanding it too much.
I carefully measured and marked the pattern for the screws and rivets on both the spinner and filler plates and drilled all the holes to #40 to start.
With everything clecos in place, I checked the coarse pitch one more time. I’m glad I did. There were a couple spots that were still a bit tight. Once I rivet on the filler plates, it’ll be much harder to tweak the gap.