We study the tekko in the system of Kobudo that I study. Typically we dont get into it until a student is a shodan in kobudo. The kata we study is Maezeto no Tekko from Taira Shinken. While in many ways the tekko will reinforce your punches, it has fantastic benefits with regard to gripping body parts. Grabbing someones wrist witha tekko enhances the pain and pressure on teh bones astronomically.
_________________________
There is always someone who knows more, and noone who knows it all....