AN informer who helped crack a $35 million drug syndicate was jailed yesterday for eight years after a judge cut his 18-year sentence by 10 years. Mok Lun, 53, was convicted of dealing in heroin but had his sentence reduced because of the help he gave police. He is now under special protection at a secret location after being transferred from Stanley Prison. Mr Justice Gall, in the High Court, heard how the informer helped convict a gunman who snatched three police revolvers during a robbery in which he ambushed officers. Prosecutor Barry Moorfoot said Mok had been involved in a syndicate which dealt in 65.5 kilograms of heroin worth $35 million during a six-month period. The father of three delivered the drugs to other dealers. He was caught with 570 grams in Shanghai Street, Kowloon, in September 1992. At his first trial, Mok denied trafficking and was sentenced to 18 years. His conviction was quashed by the Court of Appeal on a technicality. But when a retrial was ordered, Mok changed his plea and offered to help police. On Tuesday, ringleader Lam Ching-ho, 38, was jailed for 24 years for three charges of conspiracy to traffic in 65.5 kg of heroin between September 1992 and April 1993. His right-hand man, Chan Chi-keung, 40, was jailed for 22 years after he was found guilty of one charge of plotting to traffick in 9 kg. The convictions followed a lengthy High Court trial in which Mok was a key witness. Mr Moorfoot told Mr Justice Gall the defendant had been assaulted while in custody and now feared for his life. Defence counsel Christopher Grounds said Mok had placed himself at risk by giving evidence. Mok also testified against robber Li Leung after the gunman confided in him while awaiting trial in Lai Chi Kok Prison. Li was jailed for 15 years in 1993. Mr Justice Gall told Mok his evidence had been instrumental in securing the conviction of his former bosses. In a separate High Court case yesterday, transport worker Wong Wing-ching, 31, was jailed for 20 years after admitting trafficking in August last year in about 34 kg of heroin worth $30 million. Mr Justice Chan jailed him for 20 years for two trafficking counts and two years for a separate drugs charge. The sentences are to run concurrently.