Thu 05 May 2004O'Toole gets fours chanceRowing : Thirteen years after he won Ireland's first world championship gold medal, Niall O'Toole has a chance over the next three days to stake a claim for a place on an even bigger stage.The 34-year-old Dubliner, the world's best lightweight single sculler in 1991, sits into the lightweight four in today's heats of the World Cup regatta in Munich knowing that an Olympic berth in a hugely promising crew is within his grasp.