I found it much easier to make a sliding carriage for the thread tension system..
Makes it much easier when working near the ends of the sections..
especially the tip end of the tip section...
Did this by adding a center rail between the uprights, as well as a third independant sliding rod support.
It's much simpler than it sounds...Nice setup....
And it does look as though yours also has some slide capability in the tension system!?!?
Via the rails used in mounting to your base...
Great idea....