RavenInstinct

I want to purchase the JoJan Helical fletching jig, but there is 3 nock receivers that I am unsure about F51, F61, F71, it talks about the different degrees on each one, but I am unable to find any real information on what those degrees mean and what the nock receivers do in different to each other. Which one do I need if I want to do 3 helical fletching? Also if I want to do 4 fletching is helical possible? I think the F71 does 4? I want to get into hunting but want to become a good shot first. I am using a 55 inch, Beech custom self - recurve horsebow, 50lbs.

Thanks