explains well what you want to get that phrase is not clearto pass perfectly in the center you have foreheads
draw the tondino that has as constraint the passage in the center of each equal stake, thus increasing the diameter of the tondino or moving the hole, the system design without having problems.So what? What's the problem, drawing the 12 tondino?
If it's not a problem you can give me an example, thank youdraw the part in the environment together by binding the trajectory to the holes.
then you can do the round as sweep or as structural element