Very nice job John.
I'm working on raising up 2 bar stools. They are too short for our new kitchen island in our new house at the farm. I made 4 round, 11" oak disks. 2 of them get screwed to the lazy Susan plates on the base and 2 attached to the seats. I will bolt 4-2"x 8" spiral oak dowels in between each set of disks to raise the seats up. I plan to bore the dowels and use all thread to bolt the disks and dowels together to make the assembly real strong.