an image search of tetsubo has some really odd returns. Evidently a tetsubo is also some kind of steel parallel bar that is used by gymnasts, energetic jumping dogs, and for some reason, a couple of oriental schoolgirls to hang upside down from exposing their panties. Dont blame me, blame google.

Here is the best weapon image I could find from the extreemly limited returns. Is this the kind of weapon you had in mind kiru?