A career criminal was so desperate for work after allegedly turning over a new leaf that he attacked a restaurant manager with a saw when he refused to offer him a job. Ng Shui-kwok, 50, was jailed for four years yesterday after pleading guilty in the District Court to one count of blackmail, one of making a hoax bomb call and one of wounding with intent. Prosecutor David Leung told the court that Ng went to Pak Rock Restaurant at Kai Yip Estate, Kowloon Bay, on September 25, the day the restaurant opened for business. Ng approached personnel manager Au Tak-yim and said: 'You are newly opened. Don't want a mess? Let me do something for you.' Mr Au invited him for tea in the restaurant but did not offer him a job, Mr Leung said. Ng returned to the restaurant that afternoon and repeated the statement to Mr Au, who again refused to offer him a job. Ng later called 999 and reported there had been a fight at the restaurant and that several bombs had been planted there, Mr Leung said. Ten police officers spent about 25 minutes at the restaurant searching for bombs but nothing suspicious was found. Ng went back to the restaurant on October 3 and threatened to assault Mr Au. The manager ignored the threat and called police. Ng was arrested for blackmail later that day and released on police bail. He then armed himself with a saw and went to the restaurant looking for Mr Au. Ng struck the manager with the saw after scolding him for having 'framed him', Mr Leung said. Mr Au suffered a cut to the forehead during the attack and Ng was arrested. Defence counsel Victor So said Ng, who has 39 previous convictions, wanted to turn over a new leaf after his latest release from jail last February but could not secure a job. At the time of the offence he was desperate for work and committed the assault out of anger at Mr Au's refusal to give him a job. But Deputy Judge Michael Jenkins described Ng's conduct as 'outrageous' and said he had shown 'open defiance' of the law. The judge said the court must take a serious view and impose a deterrent sentence.