I'll second Carol's wishes, and hard headed that I am I'll once again try to save you some time and back brakeing labor hand mixing all that cement, but this is the last time.
Let's keep in mind this is a pier support piling for a back yard telescope, not the foundation for a new Dome of the Rock. There are no negatives with pre filling the hole with concrete block. It is the same material used in the hand mixed stuff you are about to use. It is just as strong, there are NO issues with inserting rebar.
You can listen to the nay-sayers if you wish, good luck with the pour. By the way, it a whole heck of a lot easier to load the hole with block than it is to mix and pour the equivalent amount of concrete by hand. I've built 7 foot high X 2 block square house piers with cement blocks laid up dry and filled with rebar and concrete. they are still standing after 30 years.
I added yet another layer of block to this before filling the hole with concrete.
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