I didn't want to steal the "something unusual" thread, so I am going to pose the question in a new thread. I have seen this before with eccentric pieces and now in the "something unusual" thread. That would be a knapped hole. I am sure you apply the same knapping techniques once you have the hole started, but what I don’t know is how to get the hole started in the first place short. I am sure if you had a thin enough piece you could shoot it with a BB gun and hope for a hertzian cone without breaking the piece. I know, that would be a big gamble and not practicle. So, has anyone experimented with this or know the technique for starting a hole?