My buddy brought over his Magnus 4-blade stingers that I recommended he buy. I use Slick Tricks and they come with a washer that you can spin to different positions to help the head spin true. His didn't come with any washers, and I was at a loss to figure out how to get them spinning absolutely true. He's got Goldtip XT 5575 shafts. Out of 6 only 2 spun perfectly, and the other 4 varied from close enough that I would shoot them to having enough wobble I wouldn't trust them past 15-20 yards max. What can I suggest to get these heads aligned?