I know that I'm pretty anal but I use a surface plate, v-blocks and a dial indicator. I have to say that with the Gold Tip XT Hunters that I use the inserts fit snugly and all of the heads run true. They all pass the spin test, I can just find which arrows run concentric to the broadhead within .001 vs. .003 for the bad arrows (I told you that I'm anal). I try each of these arrows with a broadhead to make sure they fly and hit good and then I save those arrows for hunting so that I don't damage them while practicing.