Kevin,
I like the Ivo prop install......it would be great to have an adjustable prop; however, that one got backburnered due to budget in my case...maybe some day.
Mark,
Forgot to mention; but Kevin's post reminded me, there was also a 1/4" steel crush plate which I believe came with my prop for use depending on what other stuff a person installed - photo attached. Ignore all the wires - that was a data logger testing the effectiveness of the Tanis heater (tends to get a little chilly up here in the winter)