Mora shower is leaking even when it's completely closed. Flow control valve should be replaced with a new one. Mora MMIX / Cera flow control valve part number: 409354 Check your mixer model instructions for correct part.
Removed my handle and valve as shown in the video only to find my valve end was sadly different ( different mixer unit), but video helped me. My black rubber washer was worn around the edges. In the immediate absence of a spare washer, i flipped it over and retightened everything. Fixed.