One more thing. If you are running a flexplate look hard at it. The ring should be the welded at the same distance from the center plate. Presumably centered. If not it will be a wobbler and shove the pinion around. I see too many of these come through here. Even the blessed sfi versions suffer from this. Probably since they all come from the same place, get irridated and stickered and a primo price tag attached. This also affects the runout as noted previously. You may want to mount your converter if used in a lathe and attach the flexplate to check it for wobble. Runout will be tough to judge unless you make a simple adapter from the convetor nose to the flexplate center hole to center it all up. They "flex" so just spinning it by itself will just make your eyes wobble. Clamp it down and it can be a different story.