Hand Building Easton Axis Match Grade, Long Range 4 MM Long Range Shafts - Hunter's Friend Pro Shop 

It is made by Grayling, and it is simply named the Grayling Jig. It is nothing fancy but I love the simplicity and it can keeps up with jigs that cost much more. It can do a helical turn but you have to have the appropriate clamp - that is the same with any jig though. A helical clamp has a bend to it so you would just set the JIG to however much of an offset you would like and the helical clamp does the rest to add the bend/curve to the vane/feather making it helical. Cool thing about the Grayling Jig is that you can get a right, or left helical clamp so it is possible to fletch virtually any configuration with it and it is super affordable.