IF former Queensland jockey Glenn Boss was the happiest man in Australia yesterday Jim Cassidy may have been the unhappiest. Boss secured a late engagement for Lee Freedman's A$2 million Golden Slipper Stakes winner Flying Spur when a Supreme Court bid by Cassidy to have a six-month disqualification quashed failed. 'It's the greatest thrill of my life,' Boss declared. 'I can hardly believe my luck to have got the ride and to have won the Golden Slipper. 'It's fantastic.' Ironically, Boss was also called to the Australian Jockey Club offices on Friday - along with Cassidy, his younger brother Larry and Kevin Moses - to give evidence in a race-fixing inquiry. But while Boss, Larry Cassidy and Moses appeared, Jim Cassidy, who was said to be acting on legal advice, did not. That led to Cassidy's disqualification and the engagement of Boss on Flying Spur. His ride was superb. After jumping quickly from the number one starting gate, Boss allowed Flying Spur every opportunity to settle. He then brought him through the field to strike at the leaders approaching the 100 metres. Flying Spur went on to score by a half-length from Octagonal, who also finished fast, with Millrich a neck away third, just ahead of New Zealander Our Maizcay. Owned by the Arrowfield Group, Flying Spur, who paid A$22.40 for A$1 on the New South Wales tote, provided Freedman with his third successive victory after successes with Bint Marscay in 1993 and Danzero last year. The excitement of the Golden Slipper tended to attract attention away from the race-fixing injury. Chairman of the AJC's stewards John Schreck revealed yesterday he had asked two more jockeys to appear before him. Significantly, he said he believed the result of the inquiries would 'not be anywhere near as dramatic' as everyone was expecting. An investigation into the matter is being conducted in conjunction with the New South Wales police. The scandal has also spread to Queensland and South Australia.