Hi, I am Ken Baker. David Mccaslin was my GG Grandfather. I am descended from his son Andrew Jackson Mccaslin, and his Daughter Manerva Elizabeth Mccaslin Baker. The only thing that I have found was where he helped start a Meth Church at Natural Dam, AR., a community nears Rudy AR where they lived. The M initial I don't know about. I have heard that it was actually a W for Wasson . I live in Washington Co AR near where they lived in Crawford county. Where are you located and what line do you come down from? Ken