I remember a contraption that was like a bag with holes in it to restrain cats. They are so agile and they are just really difficult to hold onto, and forget it, they have teeth and claws. I’d much rather restrain a dog, even a big one, because you can get ahold of them.
The vet I worked for had a good way with cats and she never had us hold cats when she worked on them. I was thankful! LOL
Actually, it ain’t hard to work on a cat.
Large sheet. Wrap the cat. Not usually that hard to do with a cat you’re reasonably friendly with, as he doesn’t know what’s coming. Leave appropriate part sticking out.
Unwrapping the cat can be a little tricky.