Ironically enough I'm currently working on a whistling arrow head. The plan is to let it fly at next weeks 3D league shoot just when the wheelies are getting a little too serious. The one I am currently playing with is really LOUD! Should leave at least one of those guys in wet dress slacks(seriously what kind of a man wears dress slacks to a 3D shoot in Alaska?)
PS I have seen the 3rivers one but I like to make things for myself.