@ PhiIcox,..
I put a tiny DOT with a sharpie, on my "cock Feather" Then, Nock the Arrow and shoot thru Paper at 12 Feet, turning the Arrow Clock wise ONE Vane at, a time, til I get a "Bullet hole" in Paper. The Plastic Nock has a tiny Tab on the side of it. A right hander, starts with the Tab pointing to the LEFT of Cock Vane ( Cock Vane, pointing UP,.. the one with the tiny Dot ) . I use ALL ONE Color Vanes and mark the Cock Vane with a couple of arrows ^ ^ pointing UP when, the BEST cock vane, position is found. Then wipe the dots off with acetone, after cock vane is "found" and marked with 2 of, the,.. ^^ Ranch Fairy on YouTube has a good vid on how to do this. "Nock Tuning" is one of the best kept archery secrets for awesome arrow flight/ accuracy and "Indexing" can be skipped as NOT necessary. I do SPIN Test my arrows FIRST and Junk the "Bad ones",.. first, BEFORE Fletching them. Nock Tuning, works great, for,.. ME ! You must have good Bow Hand "Form" , Trigger release, etc., IF you get TIRED,.. stop ! I usually do 3 to 4 arrows at a time, to keep good concetrarion and form. I also like some weight forward, on my Arrows ( FOC) of 11% to 17% ! Good luck !