Use a piece of stiff wire (coat hanger) with a loop as shown to fish each bolt down the inside
of the center post. The bolts are #10-24 X3/4 stainless steel with a small lock washer on
each. The other nuts are shown here and there will also be a couple flat washers used when
the wires are attached.
Step 3 photo 3
Hex beam by K4KIO