With a T-4 turbonock your arrow spins like a turbine. If you fletch them with a left helical/offset broadheads will come unscrewed in flight. You won't notice the effect until you go to pull a broadhead from a target. With a regular nock the broadhead comes straight out, the t-4's make a spiral cut, you can't pull the arrow straight out.
Yeah BobCo19-65 those are some wicked heads !