I put some blue dry marker ink on the 3 bolts and the screwdriver is Pointing at these 3 bolts they are in the center of the 3 backing plates I tighten these first while watching the backing plates so they won't over lap each other. Then I start tightening the rest of the bolts, I also check the trueness of the sprocket as I go up and down and side to side wobble. I try to get all up and down slop out and side to side to around no more than 0.015 play.
Look close, you will see a wire pointer I'm using as a guide to true up the sprocket As I spin the wheel I don't want the gap between the wire and the teeth to change. The sprocket is marked with blue dry marker ink and the pointer wire is next to it. I have the wheel mounted in the vice by its axle and griping the axle on the axles nut so I don't damage the threads on the axle.
You can see the pointer wire against the blue funnel in the back ground. The pointer wire is mounted on a strap of flat strap and clamped to a shelf in the back ground and not hanging in the air by magic. Look close and you will see the bolts are sucked up quite abit in this picture.
