Does anyone have a good source for buying a 1/4" camera screw for attaching my 11x14 to a tripod. I lost the one I had and thought about making my own, but a normal 1/4" bolt is to thick to move along the slot on my tripod head. It would only fit through the center hole and not be able to slide forward or backwards. I need to be able to move the screw to better balance this camera because of it's weight and shifting front and rear standards. Any suggestions welcomed.