Jockey Eddie Lai Wai-ming turned in faultless riding displays to land a running double on Grabbit and Rocket Win at Sha Tin yesterday and then heaped praise on trainer Danny Shum Chap-shing, not only for the winning opportunities but for his perfect riding instructions. Grabbit has been something of a nightmare horse for supporters, having failed to open his winning account in 16 starts despite being regularly supported, but he finally produced the goods with a rise in distance, even though the margin was only a nose. The Woodman gelding began with uncharacteristic brilliant to eventually settle in the box seat and he managed to gain the verdict on the line after a drawn-out duel with the Sean Woods-trained Green In Blue (Shane Dye). 'Danny said the horse could be very lazy and told me to be strong on him and push forward early to take a prominent position,' said Lai. 'He said he would respond to strong riding and the instructions gave me a lot of confidence, which always makes a difference. Full credit must go to Danny.' Lai added he had spoken to Brett Prebble, who had ridden Grabbit at his previous start, and he had also suggested that the four-year-old would be better served racing closer to the speed because he is just one-paced. Shum, who later completed a double when Triumphant Diamond scored a well-overdue win, said the 2,200m was right at the bottom of Grabbit's optimum distance range. 'He would be much better suited in races over even further, even up to 3,200 metres, which means he's not really an ideal Hong Kong horse,' Shum said. Lai's second win on Rocket Win was achieved in much easier fashion with the Ricky Yiu Poon-fie-trained gelding scoring by a widening margin and breaking the track record of Courageousheart, set 13 days earlier. Lai gave the five-year-old the run of the race on the back of a solid speed and it became obvious early in the straight he had the race in his keeping, drawing away to score easily over Top Honor. Victorious Triumphant Diamond's rider Eric Saint-Martin said that after experimenting with different riding tactics, it was clear the horse had to be saved for one late run. 'We have tried riding him closer to the speed but the more you wait the better he finishes off, but it's not always easy for horses you have to ride so patiently - they always need a little luck,' the Frenchman added.