IIRC...those 2 bolts are what hold it tight. I believe I just started them and the hub slips down over the shaft collar retention piece and allows the bolts and hub to then be tightened. I might have pics but will take some time to find them.
I believe you’re correct now that I’ve looked at it out of the frustration zone. Looks like the trick is tightening them alternatively a little at a time. That and PATIENCE...