I was pulling my hair out with tuning this summer when I finally put all the arrows I was using on a spinner. Wow! Every one of them wobbles.....with or without heads, and they all have HIT's in them so no outsert to blame. These are all arrows that were fine this Spring, but after a bunch of shooting they certainly aren't straight anymore. These are GT Kinetic XT 200's with .003" straightness and I had the shop put them on their spine and straightness tester. Every one of them was now above .005". I shoot them at full 30" length. I tested a few of the new ones I have sitting here and they're fine, they spin true. But I guess they don't hold that straightness very well. I have other arrows that I've shot since 2008 and they still spin true. Ya, an arrow spinner is pretty handy if you're a perfectionist.