RH/LH or RW/LW are only critical that you get the helical for which wing your natural feathers came from. A RH helical is for a right wing feather and left for left. That ensures that the natural curl of the feather matches the way you are bending it around your arrow. Other than that it doesn't matter a hoot if you spin them to the right (clockwise) or to the left (counterclockwise). If you're shooting vanes you can use any of the three you want. Just make sure that you can get them to clear through your rest. If you don't want to go to a helical clamp you can put more offset in your straight fletch jig and get the same effect although helical will spin your shafts a bit more than an equally offset straight fletch.