Ron, and all:
Well, I've found no additional info on this sight.
I rather suspect that this one is incompletely assembled, in that the large headed screw was probably supposed to thread further into the left-hand end, (to which the hand wheel is attached), and thus the screw head would act as the outboard bearing.
Careful torque indicates that the screw is not going to release. Thus the only option appears to be to cut off the screw head and then thread it back on to the appropriately shortened screw.
Unless someone has more info, or a better idea, guess that will happen in due course.
Barry
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