i agree with jmbuckhunter and ducsauce...

graphite/carbon has a weak and stiff side...wether were talking fishing rods or arrows...theres ways to find it...

if you build your own arrows, you would actually be intelligant to find the weak or stiff side and mark it so you can fletch all your arrows exactly the same...instead of some cock vanes on the stiff...some on the weak...some in between etc....not sure if theres a "rule of thumb" on if you wanna shoot stiff up or down or in or out or whatnot....but ive heard of archers doing it before...and know guys that build fishing rods and fly rods have to do it...could you imagine having a 5 piece flyrod with the spine on all 5 pieces being different?? that would be a NASTY rod to try to cast and play a fish on!!