Photo 4: Shows the upper section.
Attach the 1/2" x 1/4" Bell Reducer - use 2 pipe wrenches,
1 on the reducer and 1 on the coupler, and tighten so the flange turns on the pipe,
but snug enough so that it doesn't wobble.

NOTE: This step requires a 1/2" - 13 NC Tap

Re-thread the bell reducer with the tap.
There is no drilling required since the size is correct,
but there is a difference between the pipe thread and the machine thread.
Thread the 1/2" x 12" threaded rod with 1/2" nut into the reducer.
The rod and nut are the "adjustable" parts.
The rod can be screwed in or out as much as needed
and then the nut is tightened down to lock it in place.
The height depends on which mold is used and the size on the inner disk used with the mold.