The Rolleifix quick-release tripod head is great. It's described in "The Practical Accessories" booklet: https://butkus.org/chinon/rollei/rolleiflex_acc/rolleiflex_acc.htm
"Can be used for all Rollei models with grooved edge an the tripod socket.
Designed for: Quick fastening at the Rollei to the tripod or to the bracket of an electronic flash unit.
Operation:
1. Screw the Rolleifix firmly to the tripod.
2. Raise the catch on the under side of the lock-lever and push lever downward.
3. Place the camera on the Rolleifix and slide it forward so that the tripod socket reaches the forward end at the retaining grooves.
4. Throw the locking lever upward to secure."
"Can be used for all Rollei models with grooved edge an the tripod socket.
Designed for: Quick fastening at the Rollei to the tripod or to the bracket of an electronic flash unit.
Operation:
1. Screw the Rolleifix firmly to the tripod.
2. Raise the catch on the under side of the lock-lever and push lever downward.
3. Place the camera on the Rolleifix and slide it forward so that the tripod socket reaches the forward end at the retaining grooves.
4. Throw the locking lever upward to secure."