To achieve the desired height, you'll sink a first section of 29.52 inches tall.
The filling will be carried out by inverting the mold that is closer to the larger set as the picture above.
After demolding, column position the mold about 2.36 inches above and fill. Suffice it to repeat the operation to obtain the desired height
You can position a PVC tube of 7.87 inches for a hollow in the middle of the column to insert then rebar (4 strands) and filling then concrete over the entire length.
It is important to grease the mold with mineral oil or cooking so as not to stain the white concrete inside the mold and the PVC pipe that we withdraw before complete dryin..