It works like this.
Just put your arrow in the jig without the clamp.
Hold the nock knob stationary while rotating the arrow so thata goodfletch is re-indexed where the clamp would normally be.
Put the clamp onthe good fletch to prove it's in the right spot.
Then remove the clamp and redo your fletch the normal way.
Turn your nock back to match your other arrows when dry.