A: It can be used on paver blocks. It is intended to be placed on top of a paver surface.
A: yes, the hole in the base allows the pole to go all the way to the ground.
A: The stem of this base screws into a bolt that comes up from the base to attach to it and secure it into place.
A: A one-inch umbrella pole would fit fine, it just wouldn't be quite as snug as the recommended 1.3-1.8" options. However, since this has a support knob to tighten it down and it is designed to have to go under a patio table you should not have any issue
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