HB 75-100 Adapter-Ring | the ring allows the HB-75 to be mounted on a CP-38 II series tripod | this can be advantageous when using a ball head with a smaller diameter, as the mounting plate is then filled in more than would be the case with the HB-100.
The kit contains the adapter ring and 3 screws. The mounting is done after the shoulder plate is removed. After mounting the adapter ring the HB-75 can be mounted.