I am teaching a studio class spring semester, and have been put in charge of getting all the cameras in working order. Most of the 4x5s are newer Calumet,but in the back of the cabinet was a old Grover. The Grover is in good shape, but there is no way to attach it to a tripod. There must have been a rail clamp at one time. but it's no where to be found. This Grover has an octagonal rail. If any one knows of a rail clamp source for this camera please let me know.