They can be used for a whole lot more than just spine.You can set pin gap.Heck you can even print target 5 spot faces and fita targets and vegas face targets on AA.



If you have bows with as little as 5-7 fps ibo rating,your arrow choice could change or you may change poundage by 1# to get that perfect spine.


You definately don't need a program to get the perfect spine but mine has worked on all MY bows.I has been a little off for some others though.


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