I'm one that enjoys ALL the details. And one day, when I was about to open up the holes in one of those turned spinners, I decided to check it's balance before doing so. (It's going to get checked after opening up for sure, but wanted to see beforehand just how perfectly those perfect things are.)

It was out of balance. So I checked the backplate to see which part was out. It was out, and the front was out. It dawned on me that to get them both balanced, I'd need to do the backplate first.

I've checked them all since that day, and have yet to find one balanced. Does that mean they all need to be checked and balanced. Truth is, nope, not even. They aren't props and don't have the leverage a bad prop would have. And I've yet to see one of the turned spinners that came close to being as bad as props can be.

I actually look at balancing those little babies as a way to prove the balancer's accuracy. And balancing spinners is the first anal thing I do that I'd quit doing. That is, if I didn't enjoy this hobby so much, every bit of it. BTW, I don't bother to balance plastic spinners. They're so often less than aligned, what's the use.