I have not yet secured the part, would like to inform myself in advance. I could not find a suitable cone nut/nut nut key so far. A nut would have to have an outside hexagonal actuation or be almost 7cm long. I think it would be too expensive to build the tool myself from a pipe. Do I come here also with a hook key, with the pipe tong or with a screwdriver with a continuous soul and hammer? The length of the groove is 6.4 mm. The diameter of the ring is 5 mm. The thread is 41 mm at the bottom and 12 mm at the top.