I don`t know , if you are still searching. You will find something about rhe Nehls and the Saefkows, if you search in the Internet for :Triepkendorf+Saefkow. Triepkendorf was the central church for Mechow.
If you want more, than you have to search for Joerg-R. Kropp, who is a relative of the Saefkows and knows very much about them.
You also may ask me again.