There are a lot of other ways to solve this problem. For instance you could use one hole straps Tek screwed to the bottom of the the existing strut. You could use coupling nuts to add more all-thread to the existing all-thred and add anotherlayer of strut. You could remove the wires from two of the existing conduits and use those tubes as your structural supports. [Add a couple more conduits to re-route the wires to the lower level on this one.]
I am waiting for someone to come out with a UniStrut extention. It would basically be a piece of steel channel which would slide into the end of the existing strut and be bolted into place.
~Peter
