Hi Curtis,
They do not use the collar any more for that second set of threads.
I am travelling at the moment, but I can send you a copy of a manual. It is still not finalised.
There should be a white line on the back of the blades, 8 1/2” in from the tips. That is the reference line for setting your blade angle. You set the blade angle referenced to the front face of the hub. Mine are set at 22 degrees.
Send me a PM with your email, and I can send you some info.