If you want to spend some money then check if any of the scroll chucks ( supernova, talon, anything like that) has a 3/4 x 16 isert for mounting on the lathe.
Another suggestion from a member of another group( Thanks Randy) suggested looking for a 3/4 x 16 nut and bolt. Screw the nut half way onto your spindle and then screw in the Bolt. Then grind the bolt down to a point to use as a dead centre. Or if you know an engineer ask him to turn you a longer sleeve to replace the nut for this idea. it will give a better grip. Or get two nuts and weld them together for a better grip.
Though you shouldnt need too much strength at the spindle end as using a dead centre means that the pressure is pushing the centre on to the spindle
Last edited by Crazybear; 01-12-2008 at 07:50 AM.