Busted the bleeder screw part of my water outlet.

I have a d15b2, and I busted the shaft where the bleeder screw fits into. Now I leak coolant whenever I turn on the car. I've ordered the OEM parts and everything to replace them. But it means I have to drain my coolant. My question is, does anyone know how much your supposed to torque a bleeder screw down? I obviously over-torqued it if i broke off the shaft. I read its about 6lbs, but I dont have a wrench with a torque measuring needle, any help?

Just tighten it snug. Don't put all of your muscle into it.