Park Tool TNS-15 Threadless Nut Setter
The TNS-15 is designed to install star flanged nuts used specifically with 1 1/4 and 1.5" headset systems. To use, simply thread the nut onto the TNS-15 and tap into the fork's steerer tube with a hammer. The TNS-15 helps keep the nut straight and sets it to a depth of 15mm.
This used to be the acceptable old school solution. It has not been okay for a long time and we all know it. But a setter with a guide instead. Like the Titan: http://www.pricepoint.com/Brand/Titan/Titan-Star-Nut-Setter.axd Or the Park: http://www.pricepoint.com/Brand/Park-Tool/Park-Tool-TNS-4-Deluxe-Threadless-Nut-Setter.axd