I realize that the most common way to mount a toroidal-core transformer is by sandwiching it between two rubber-padded plates with one long screw holding them together and to the case (or whatever it's mounted to).
But I was thinking of another way to mount a toroidal core, in particular the kind that's made of a roll of iron alloyed with silicon (which is the best for low-frequencies, such as 50hz/60hz power transformers). What if I were to drill and tap 2 adjacent holes into the core (perpendicular to the laminations), and then use screws to connect it to a case. If the case is the perfect width, I could even put another screw into the opposite side of the core to attach it to both sides of the case.
This would also effectively ground the core. That's a good thing, right? Doesn't it somehow add stability to the transformer?
The only problem that I can see is that the screws would electrically link the plates together.
Other than that, I cant see why toroidal cores aren't ever already mounted this way.
Edit: Note that I am referring to the toroidal cores that are made of a roll of silicon steel (notice the spiral shape in my pictures), mostly for sizes ranging from 4-15cm in diameter as in mains transformers. Not the ferrite or iron powder cores used for higher frequencies, which tend to be too small for much benefit from this method anyway.
I also changed a sentence that used to say "Doesn't [grounding the core] somehow reduce problems when the core is getting saturated?"