Andy Dingley wrote:


The trick is to use swaged rods in short sections and long tube nuts.
The rods have thick ends formed onto them and the threaded portion is
thicker than the middle. The nuts only have to be screwed on a foot at
at time.


Something along those lines occurred to me all by myself as I wrote the
previous thingy. All by myself, I tell you: (invent)tm ain't dead here.
*Not* obvious to one skilled in the arts, no; and in *no* way influenced
by the fixtures on the Clifton Suspension Bridge wot I drive or walk
across sereval thymes a day... honest!