I had a hose hanger on a 4x4 post there, and pulled it out. Then used a 6" spade and a post hole digger to deepen and enlarge the hole. That was easier than I expected. The soil was quite good. The bottom foot was mostly clay, and I saved that for backfill. Its stronger.
This picture shows getting down 20". I got down to 24" but the picture failed. I usually take several of each event and all are good, but not this time, Figures...
But I got the post into the hole and stood it upright.
I backfilled from all sides gradually. I didn't have a good tamp available, but realized the D handle of the shovel worked well. I'm good at using whatever is near at hand.
I packed that clay soil hard!
Then put a level on the top and made some slight adjustments. Tamping hard on one side adjusted the post to perfect level. And then I set metal bars on either side (anchored with cinderblocks) to hold it it place. Then I used a piece of 4x4 post (more useful scrap) to really pound the clay soil around the post.
The top was utterly level! I left the metal bars in place to assure the post didn't move while I soaked the soil and tamped some more.
That post ISN'T moving!
Tomorrow, attaching the hose reel to the platform...