Gut Check i am using an Az. ez fletcher and its left wing 8 degrees Helical. My Bitz is also LW and it gives 11 degrees Helical. I found the 8 degrees works very well. I am using easton alum. 2219's and 2213's. The Bitz. just change clamps, with the Az. ez fletcher change arms they have several combo's to work with. Mine was an original made fer alum. shafts. Hope this helps.