Here is a photo of the body clamp I made a few years back.

It’s made out of a piece of scrap oak hardwood flooring. This gives the advantage of not scratching up the reg you are working on! The straight part is where the hooka port goes. You will notice that I took my router and created an area for the reg body to sit in. See photo.

To use this jig/bodyclamp insert as in the following photo’s.

Finally, you can use your body wrench to remove the body ring from the reg. Mine was made from a socket that was made for working on a four wheel drive. I have to file it a bit. It only took about ten minutes to make and it works great.
See Bryans link for a kicka** body ring socket!
Jim