I think you should have the TT-0716A adapter if your prop hub is less than 1/2" thickness, or the TT-0717A if it's more
Thanks rajul.
Yes, I noticed this on their website last night. My prop is exactly 1/2" thick. Perhaps that other adapter will work better.
Although, shortening the retaining bolt seems like it will work.
But that sure doen't seem like a lot of strength to hold the spinner secure when I attempt to use an electric starter on it. Especially since they strongly suggest not over-tightening the retaining bolt. Do these these unscrew easily?