Well
@Mouse did us a solid and let me borrow his homemade tool. It worked like a charm using
@Ashcat advice about measuring the placement of the old seals. Now, if only my brother had remembered to put the dust shield on before torquing the hub bolts down, and then repeating that work again, only to realize that the dust shield was on backwards. So on round three we got it right. The next side went together without a hitch. Except that the spacer that goes on the stub shaft before the hub bearing was discovered laying on the leaf spring. 🤦♂️ That's what you get for rushing.