Please explain spine to me,

[Badger]

Steve I always try and get the arrow somewhat close by numbers before I start, because yes it will break and arrow especially if your target is pretty hard. I guess I need to try different Cain because I have never been able to as was said above, shoot Cain and don't worry about the spline.   I love Cain but they are a bear for me to get a consistent set so I build them 1 at a time in the same manner as I mentioned above.
 Pappy

  The little flight arrows have no point weight and only weigh about 150 to 225 grains tops. Really hard to judge spine.

[mullet]

Go to Easton Arrow site and watch their video on paradox. It will explain a lot of what you want to know.