Yes, the axle tolerance is about .005 under for these tapers. I had an axle that was almost ten under and the hub would slide around. I did get those hubs to work.
I blocked the back of the hub with a piece of bar steel, taped (not hammered) the taper in, re torque the bolts, and repeated several times until the taper flange was almost up-against the hub. Has been holding on the xi machine with fluid filled tires over a year now.
after
before giving it an extra bump.