xJim Wilkins wrote:
"Jon Danniken" wrote
Yes, thanks, I didn't do a very good job of explaining the purpose
of the nut.

The actual nut used in raising and lowering the threaded rod is not
visible in the image. The nut that is visible is welded to the
threaded rod, and is only used to give you something to put your
wrench on to turn the threaded rod.
Jon

Got it. I'd put two nuts locked together at the top to grip and turn
the threaded rod and another resting on the hole in the top of the
column to support the load.

Interesting; I had planned on having the load bear on the top of the
threaded rod (which seems to be the way the ones in the image are built) but
perhaps it would be better to spread it out on the bearing surface of the
nut instead....

Jon