I hope someone can help me out there - the switch/plug unit, what does it attach to? There is a metal plate, with four holes for self tappers, to attach to the switch unit, and a threaded stud out of the back of the plate, with no apparent home to go to. The instructions obviously refer to a previous model, and I want to get this thing up and running. I am slightly reluctant to turn it onto its feet and carry on building, hoping to find a solution, as there is a risk I will have to take it apart again. Any advice from anyone who has recently put one of these together would be gratefully received.