Perhaps they would be used in a cord drill or pump drill? https://primitivetechnology.wordpress.com/2016/01/22/cord-drill-and-pump-drill/ https://primitivetechn

Perhaps they would be used in a cord drill or pump drill? https://primitivetechnology.wordpress.com/2016/01/22/cord-drill-and-pump-drill/ https://primitivetechnology.wordpress.com/2016/01/22/cord-dr...