on on on switch 3d models

I also divided the model in 2 and 4 parts: the lobes are tagged as "north" and "south", which are the NW and SE lobes, based on their orientation in the sky. The real north and sough would be derived from the direction of the orbit of the two stars...

This way you can create a bolt of a specific thread size, save that, and then switch over to creating a matching nut. You can also do things like substitute similar threads [maybe with a differing thread pitch] just by changing the Overall -> thread...