An intermediate bracket (1) has a base member (2) comprised of stainless steel rod bent to U-shape. A sleeve member (6) is secured by screws (7) through a lug (8) into the ends of the U. The member has a tongue (9) integral with the lug and a sleeve (10) as such. The sleeve is cut open by a transverse cut (11) and longitudinal cuts (12, 14) on opposite sides from the transverse cut to respective ends of the sleeve to allows the cable to be introduced into the sleeve. The cable is centred in the sleeve by moulded polyamide inserts (21), with a longitudinal slot (22) sized to receive the cable and yet be closed with edges abutting when introduced into the sleeve. The inserts also have rims (23), protecting the cable (C) from touching the ends of the sleeve, anti-rotation swellings (24) which occupy the cuts (12, 14), detents (25) on the inside of the swellings and opposite, complementary openings (26). These engage with each other when the inserts are pushed into the sleeve from opposite ends and abut in the middle.