I did it yall. It took me about 4 fletches to get it right.
I did use the left clamp. But I worked the knobs until contact was made all along the entire left wing feather with the shaft as suggested.
But the game changer was where along the clamp I put the feather. I was putting it at the mark in the clamp I used for my compound shafts. By accident I moved the rear of the feather closer to the nock. The feather laid in the clamp perfectly.
So I fletched an arrow with the adjusted knobs, left clamp and closer to the nock.
Afterwards I compared one of my arrows 3rivers fletched for me with the one I just did. Both feathers were the same distance from the nock. (woohoo)
So now that I broke the code, I think, I feel like I can do a set for hunting with my longbow next year. After I shoot this arrow....
Thanks to all who commented. You helped me learn and gave some good advice. I really appreciate it.