I am one soldering away from finishing this thing, my collapsible VHF Yagi.
Here it is in transport configuration.
Elements are stored between the two nested tubes that form the beam
And this is with two elements attached, the driven and the first director.
You can also see how the elements are attached. They pass through the beam and are screwed one onto the other. Soldered washers act as stops.
But it turned out my choice of washer to lock the elements on the beam was not a good one. I will have to redo them with smaller and thinner washers.