ORIGINAL: smokepolehall
OK Helical usually starts at 6 degree's and goes up to 11 degree's, lw or rw. Its a spiral( curl )way the fletching clamp makes the vane or feather take set at an angle. An offset is nothing more than taking either end of vane or feather and move it left or right 2 degrees and uses a straight clamp. A circle has 360 degrees, you maybe able to get as much as 4 degrees total offset! From 0 to 8 degrees is all you would would ever need on an arrow fer CB at its useable range 0 to 35 yds.
Yup! Mike's got it right! Only thing I would add is that you won't notice anything in normal hunting ranges with more than a couple of degrees. I use the Martin jig (I have two) and I am happy. I also own a Bohning and a Cabelas and they are ok. The only thing you have to deal with is the receiver that accepts the nock end. You will have no problems with the Arizona. Just make sure the Arizona is a new one. I have an old one and it is crappy.