Ray, when I upgraded my Bogen tripod from a pan head to a ball head, all I had to do was take out three screws on the bottom of the plate. the new head then jsut went back on the same way as the pan head.
My head came with both sizes of bushings or threads, but the whole process took about ten minutes!
My head came with both sizes of bushings or threads, but the whole process took about ten minutes!