Quote Originally Posted by StoneNYC View Post
I have a Toyo45a it seems pretty sturdy...
Indeed, that's a solid camera. So the only other potential problem I can think of is if there's something about the back design that obstructs the slide-in holders from going all the way in. Unlikely with the Toyo, I would think, but try to buy with a return privilege if at all possible.

Quote Originally Posted by StoneNYC View Post
So calmut and cambo are the same? Are there other brands that slip in like a holder besides these?
The 6x12 slide-ins are the Cambo/Calumet C2N and the Sinar Panorama / Vario / Zoom / Zoom2. The Panorama is 6x12 only, while the Vario / Zoom / Zoom2 are variable-format, IIRC they have settings for 6x4.5, 6x6, 6x7, 6x9 and 6x12 - perhaps David can confirm.