A WORKER who says he strained his back in a fall while changing a fluorescent tube is suing his former employer and the Clear Water Bay Golf and Country Club for damages. Ko Kam-ching says the accident was due to negligence on the part of the Hong Kong Waste Water Treatment Plant Management Co, a contractor of the Sai Kung country club. According to a writ filed with the Supreme Court, Mr Ko was employed as a labourer by Hong Kong Waste Water, which was responsible for the repair and maintenance of waste-water treatment plants at the club. At about 9.40 am on April 10, 1991, he was working at a plant at the yacht club inside the country club. He was standing on a wooden plank balanced between a railing and a wooden crate while changing an overhead tube when the plank suddenly tilted, the writ says. As a result, it is claimed, he fell about 1.2 metres to the ground, hurting his neck and lower back. Mr Ko says the defendants were negligent in allowing him to change the tube without providing a ladder or any other suitable platform from which to work.