Peter,
For help with your camera, contact Theo at Gama Electronics. He is very helpful and knowledgeable. My guess is that the screws will be a Phillips head of some denomination and they likely have glue in them. Use a very small flat bladed jewelers screwdriver or a sturdy pin to pick out the glue and go from there. The QHY9 also comes with a screw in desiccant plug that can be used during the operation of the camera to help with moisture.
I'm not sure on how slow some take it, I have SGP set to cool to -20 over 5 minutes and to warm over 5 minutes. I never run any lower than -20 and am able to maintain that all year round.
Hope that is some help.
Cheers,
Bart.
