Note to Dan Lockwood:
Basically your drawing is what I had in mind, except the top of the bolt would have a socket for an Allen wrench to hold the torque while tightening the nut at the tapered end. Alternatively, the top could be ground to allow a box end wrench to be used instead of the Allen wrench Might be cheaper), but the finished size would need to be small enough to allow the top nut to slide over it to catch the threads below.
I haven't seen the new setup with the top brace, but that sounds like a possibility as well.
Bill in FtL
