I recently purchased a fogger V4 online. When I received my device I opened it to find there was no center contact screw. I contacted the supplier and was told that it didn't come with a screw and that it was perfectly fine the way it is. I did research on my own to find that every single image I can find all show a center contact screw. Can anyone confirm that I am indeed missing a contact screw? I have several other devices a rsst, a nautilus, enigma, tugboat, and a stillaire never have a seen any device with no contact in the bottom. I'm new to fogger any help would be much appreciated.