Here is schematically what you will be doing with the terminals on the center post. Be careful
not to flip one of the coax pieces so as to put its shield on the side of the inner conductor of
the others. It will cause big problems in performance.

Also, why not do a simple test for shorts when you get this finished? A piece of braid
touching the inner conductor would be a headache to avoid with such a simple test.
Step 3 photo 6
Hex beam by K4KIO