This is my old speed graphic, a Folmer & Schwing pre Kodak mde in about 1910 or '11. It was given to me by a friend on Long Island in New York nearly 30 years ago. It has seen a lot of use and I have always imagined it must have been a newsman's camera in New York City. It's focusing knob is very worn and I wonder who owned it and what photographs it must have made. I have modern cameras but I want to use this for a while. ...My question is: There is no focus lock on this early camera as there is on my later Crown. Once I have focused, if I let go of the focusiong knob and move the camera, it easily racks out of focus. Does anyone know of a way to put some friction on the rail so it will stay put once I let go of the focusing knob? I realize I could use a clip of some sort if it were on a tripod, but I want to use it hand held. I am hoping someone out there has had experience here. Thank You...Robbie