Done it many times before, you can even put it on a dolly to get dolly overheads.
You need a Baby Pin with a 3/4" on it. Screw the baby pin into a baseplate of some sort (if the camera is light enough and you're not doing a lot of crazy stuff, it may be okay to go right into the bottom of the camera AT YOUR DISCRETION), then knuckle the baby-pin.
Don't put any major weight on it, you'll bend the pin.
Thanks for the info. I would only be putting my 5d mark ii on it and I would be extra careful. Probably tie the strap from the camera to the c-stand so if for some reason it did detach, it wouldn't hit the floor.
Any idea where I can find one of these baby pins with a 3/4" screw? I am searching adorama.com, where I got the adapters for my lights but have no luck so far: