I was reading a non-spanking article that mentioned palmatoria. This was a new word to me so I Goggled it found that one of the meanings refers to a paddle that is used by South American countries, sometimes on the palm, sometimes on the buttocks. The word is also used to denote punishment in Chinese schools. Google it yourself.
A round paddle on the end of long lever could be brutal. Think bath brush.
The teacher in this clip seems to have a long list of names that will get the palmatoria or ruler on the palm. The licks do not seem to have much effect on the kids. I was a wuss when I got the ruler on my palms in school.
Perhaps some readers know more about this?