I have an extra screw lol. Came in a 2 pack. Simple hex allan head 8-32. Did you notice the other hole. It's drilled out to a 6-32 but un tapped. Chaïm found this in some research photos so of course I had to do it. Monkey see monkey do, lol. The screw is 1/4 inch long and fits perfect. Just deep enough to go inside without being visible inside the opening, and not sticking outside the emitter. The secret hole found by chaim is only drilled out around 1/4 inch at most. I drybrushed a hint of black around it so it stands out better.
I'm surprised no one liked my coffee idea.