How painful does this sound?

I'm a horror writer working on my first novel about a bunch of child molesters, mobsters, rapists, poachers, arsonists, and people who are cruel to animals getting a taste of their own medicine. I've come up with several different torture devices. My personal favorite I refer to as "The Chiropractor". It's a machine that consists of several metal squares connected together by hinges. It looks like a dentist's chair, but it's a mechanical hydraulic machine that turns and you strap the person to it. The open spaces where the hinges connect are where the person's joints go. All the parts do 180-degree turns until they're flush against each other. They turn forward, backward, and sideways. The machine bends the person's feet inward until their ankles are touching their inner forelegs. It hyper-extends their knees until their shins are flush against the front of their thighs and then hyper-abducts their hips until their outer thighs are flush against their rib cages. It does the exact same thing to their wrists, forearms, and shoulders, too. The last thing The Chiropractor will do is bend the person's spine backwards until it snaps like a branch. How does that sound?