Mount the mounting flange  directly on the encoder flange . After mounting the self-aligning coupling  on the encoder shaft, place the rotary encoder with flange and coupling on the cable housing . Screw the flange to the housing and fasten the coupling through the lateral hole on the drum shaft of the cable. The plastic cover  prevents foreign bodies from entering the cable housing.
For detailed instructions regarding encoder mounting refer to the user information of the SG21 wire-actuated encoder