Step 3: Upper wheel
Saw two notches in the 3" down to the center line on the PVC Coupler, verify your threaded rod can fit down in it nice and level.
Assemble one of the wheels onto the 6"bolt , and put washers and nuts on both sides. slide it down into the notches. and finger tighten the nuts on the outside of the fitting. (you will need to slide this out of the notches when putting the belt on.
Using a few drops of superglue, glue some pvc Teflon tape to the upper wheel and cover it in about 2 layers of Teflon, superglue down the remaining tail
also go ahead and assemble the other parts, the lightbulb socket, and the 1.50" adapter and the 2-3" adapter, install loops of bare stranded copper wire around the single screw left in the light socket, once affixed, snip open the loops to make lots of copper brush bristles, bend/shape them to just glide over the wheel/belt to pickup the static charge and transfer it to the socket/and eventually to the lightbulb/globe