Step 3: Add pieces to the tower of the structure
Predrill a 5/16" hole to hang the hook onto a 3-6" 2x4. The hole should be 1 1/2" from the top. I just used some scrap and didn't bother cutting it. Attach that to the tower.
Attach another 3-6" piece of wood so that it is centered 12" below hook.
Screw in hook to predrilled hole.