Is anybody aware of any illustrated texts regarding the use of tonfa in shotokan kata? We started using a bo in a meikyo bunkai (logically) then branched out to using tonfa in the hands against the bo. It seemed to us that there were a number of shotokan 1st kyu and above kata where the use of tonfa would apply, including bassai dai. We didn't miss out Heian Nidan either. Anybody with any thoughts or information on this, particularly regarding the above please get in touch.