Good score, on the Nicro!
I got one just like yours Bold Java, for $3. last weekend, complete with glass Cory Rod. However, the gasket is shot. I resurrected another Nicro with a gasket from a wide mouth glass vacpot a couple of years ago that works well, I wish I could find some replacement gaskets...sigh.
As far as prep, get it good and hot before adding in the coffee. Do a wet run without coffee grounds, and lower the heat until the water returns to the lower bowl. Increase the heat, and when the water fully re-enters the top globe then add in the coffee. @ 3 minutes remove from heat source and try to get the time to 4 minutes total time of coffee and water in contact.
Great way to make coffee in the woods!