I made one out of a small box and some old roller skate bearings.

In order to measure an arrow accurately you would have to be able to move the dial indicater to different spots on the arrow moving from one end to the other. Not just do it in the middle. Of course unless you work in a machine shop you probably won't have that type of equipment. I wish I still did quality control, I could really put some arrows to the test with the stuff I had available to me.

I saw the same thing when shooting spots a few years ago. Some guy brought in one of those ballbearing arrow spinners and everyone was playing with it. Guys were putting their carbons like Gold Tips and stuff on there and were not impressed with the results. And I'm not talking GT's and Terminators, I mean the expensive models. Then somone put a set of X-7's on there and they would spin perfectly true. Same thing with the cheap Easton Jazz kids arrows I was using. That ticked a few people off.

Of course some of those guys with the wobbly carbon arrows still shot better scores. It doesn't seem to make a huge difference at 20 yards with target tips. Like you said though, I would not want to put a broad head on some of those arrows I saw.

After seeing that and reading some of your reports (and others) I just laugh when I hear someone say carbons are either stright or broken. Then when they look at me I tell them they are lucky if they are straight right out of the box half the time. And I have seen some carbons after being shot for a while that were flat out crooked at the end. You didn't need to put them in a spinnner.

Paul