Step 2Assembly
iImage Information

Cut the 4x4 long enough to leave enough room for all the parts shown in the schematic. Drill a hole long enough to mount the all-thread, leaving a couple of inches sticking out. The 4x4 plus the all thread should just be shorter than the floor to ceiling distance. Don't leave too much all-thread showing, particularly if you use smaller guage rod as it can bend.
Force fit the allthread, thread on two nuts, followed by a washer and the pad. The pad is simply a scrap of wood with a hold drilled through to admit the end of the all-thread. You can pad it further with a piece of carpet if you want.
By force fit, drill a hole that is slightly smaller than the diameter of the all-thread. Then just pound it in to the support 4x4. When you tighten it, the axial compression will hold it in but if you drill a hole too large, you may end up with some play in it.