Hi Michael,

>> all in the same plane...

I got it work with some extra steps as you can see in the image
So it is possible in MOI3D

The other images are juwellery with a fasten method called 'Pavee'
(french for paving), and i use TangentSnapping to find a center-
point between 3 points

>>there will not likely be any solution
It's not a real problem,but if you find it i'll be happy