Well I am not a clawhammer player, but crossed paths with Dan Levenson today and I know he is one. I just wanted to let you clawhammer folks who are not familiar with him that he is personable, knowledgable, and quite capable if you read his bio here - username is clawdan - wonder how he came up with that!! If I were pursuing clawhammer I believe I would ask Dan to help me and invest in a few lessons. I believe he has the Skype capability for long distance lessons too.
Just sayin'.