I know you said that you have voltage to the center pin on the Panzer, but do any devices actually fire on it? There are just some combinations that don't like to work together without adjustment. In other words, each device has its own tolerance with regard to the contacts meeting and it could be a minuscule difference. Some devices make allowances for this and some don't. I believe the Panzer has an adjustable center pin and I would wager that if you were to adjust the center pin with the Nautilus screwed onto the head you could then screw that onto the battery tube and it would fire. * *Remove the Head from the Panzer *Screw the nautilus onto the head *Snug the center pin to the Nautilus and then screw the Tank/Head onto the battery tube*