Leo spoke about indexing on the lathe.
To index an odd number eg 11 divisions: wrap a paper tape around the perimeter of the chuck and mark the exact circumference
Then place the same tape down on a surface
Measure the length of the tape start to the marked area.
Divide this measurement by 11 to get can approximate division
Use dividers to mark off the divisions and adjust the divider repeatedly so as you get exactly 11 even divisions
This is easy and fast to do
Jim Hiltz mounted his large bowl and proceeded to hand turn the outside-a slow laborious process
Leo helped Paul figure out where to place dowels in his uneven blank so as to be able to mount it on the lathe
