I had to cut through the mounting ring after removing the hood from it (unscrewed the tiny screws holding it to the mounting ring). It will mount but is off enough in tolerances to not come off because of inadequate clearance. Using a dedicated tripod legs, the circular tripod head could rotate very much for reproduction work and it could also be used to take up to 10 pano frames having the circular tripod head a special 6º movement to help for the task. BEWARE - This hood is not meant to work with the Rolleiflex 2.8 FX.
In 1957 F&H Rollei developed this interesting circular tripod head for the TLR, it was made to have a level instrument high precision and was better from this point of view than others tripod heads using different means like ball heads (f.e.) it had three main functions that could be used combined or separately, one was to offer a system for a perfect parallax correction for close-ups and macro/microphotography similar regarding the Mamiya Paramender someway but more complex (the Paramender is an accesory for the tripod head, the Rollei device was a tripod head directly), the system had different plates according the taking lens-viewing lens combo, this lens plate slid within a frontal fixed lens plate to change from the viewing lens to the taking lens via a lever, in other words the taking lens was placed in the viewing lens place after it was focused (you could do fine focusing again if necessary in the lenses new position BTW, knowing the taking lens had the right framing), the camera also slid on a rail smoothly for a more precise focusing with close-ups and macro auxiliary lenses specially. "F": A BIII light red filter, it is engraved like the "E" but it is older, from the "F&H" era.(click on thumbnail). "E" : B III medium yellow filter marked as described for filters from 1956, this filter box is different regarding boxes from the "F&H" era, it has the "Rollei-Werke Franke&Heidecke" company name and then it is at least from 1964. "D": SL66 B VI light red filter, it has engraved "Rollei-hellrot" (light red), "-2 -3.5", "R VI" and "Germany" in the filter ring edge (no visible). "C": Rollei 35 Tessar UV filter marked "R00", "Rollei UV" and "Germany" without EV number, however other Rollei 35 B&W filters have the EV number mark. "B": This B III filter is older than "A", it has the red "R" without bayonet size and it does not have the EV compensating number mark. The photograph above shows: "A": R(bayonet) II UV filter engraved like filters from 1956 but without EV number mark, some -0 filters have the mark anyway.
Rollei B&W filters rings were engraved with different words along the years, pre-war filters up to about 1937 were clip-on type, earliest Bayonet I (1938), II (1949) and III (1952) filters have the filter diameter marked in the ring, the filter type, "Rollei" and "Germany" and "Franke & Heidecke", from about 1953 a red "R" indicating coating replaced the diameter mark, a black "R" replaced the red one afterward and from 1956 the marks were "R"+bayonet size, "Rollei" and filter type, "Germany" and the EV compensating number.