Debi Pearl, a relatively mainstream Quiverfull activist offers this lovely tidbit (h/t Daily Kos):
"As a rule, do not use your hand. Hands are for loving and helping. If an adult swings his or her hand fast enough to cause pain to the surface of the skin, there is a danger of damaging bones and joints. The most painful nerves are just under the surface of the skin. A swift swat with a light, flexible instrument will sting without bruising or causing internal damage. Many people are using a section of ¼ inch plumbers supply line as a spanking instrument. It will fit in your purse or hang around you neck. You can buy them for under $1.00 at Home Depot or any hardware store. They come cheaper by the dozen and can be widely distributed in every room and vehicle. Just the high profile of their accessibility keeps the kids in line."
That's *horrible*. And also the exact opposite of what I used to advise parents--that while corporal punishment was allowed in my state, it was frowned on in my community, and I strongly advised against it. The caveat was that if you *were* going to use corporal punishment, to never, ever, ever use anything other than your hand (and that if you left marks, you were going to be in deep s*it with CPS).