The flashlight and toilet paper tube are the specialized apparatus. The duct tape is merely interesting background. I decided those eleven questionable eggs were not developing and broke all but three into a container so I could see if I was right. Five or six had no signs of fertility at all and three had some little bits of developing chicks in them. So I left the last three and out them back in the incubator just in case. These were ones with darker and more speckled shells which makes it more difficult to see what's going on inside the egg.
So here is the inside of the incubator now.











