Cragers rims

Is it true there a ***** to get centered.

IMO, Unless there's a recess in the wheel to locate you might expect slight offset. Once the washer bites I doubt it will continue to spin. Hold them centered as best you can while they start to snug up.
If you're a wood worker maybe you can make a small block that will keep the washers centered?
Don't forget to re-torque them a few miles and again after several more.