PUSHING the button earlier than planned on Australian Gas Light Company's investment in the Papua New Guinea gas project was a smart move, according to brokers. AGL yesterday decided to convert a sales agreement into a binding contract and take up a 10 per cent stake from Oil Search about six months earlier than expected. The booming oil price pushed up the cost of the stake to $US400 million ($A530.57 million), but Goldman Sachs JBWere said the entry price into the multibillion-dollar project was still attractive.