I just bought a mini eco ii incubator and unpackaged it, I'm not sure if I'm being dopey but it's not looking like the diagram. Instructions say I should be able to pull the back part down to adjust the temperature and access a screwdriver. However the back part is screwed shut and I can't see what looks like a screwdriver in it. Am I just missing something. Have attached a photo of the diagram and what I can see in the incubator. Thank you!