Ahh… Nope. LOL! Didn’t know that was a thing, but now that you say it out loud, and having just tinkered enough with it (pulling it up from the box floor, then doing the fillet, then rotating the top circle 10 degrees to match the PCB, then projecting the PCB hole onto it, then pulling a drill hole down)… It makes complete sense and yes I was doing it wrong. LOL!
I got it in the end, although the top of the support isn’t exactly a perfect circle… But it’s good enough.
Thanks to everyone for your explanations and apologies for my noobness.
Now I have to try doing Lofts with the supports in the corners. 
Wish me luck.