I purchased a temp controller not sure if it is a fridgemate as the box and enclosed instructions says STC-200 cold storage refrigeration controller. I have downloaded the wiring instructions from the forum ok, but for the life of me cannot work out how you get the wires into the rear of the unit, as althought i can see small holes in there cannot see how you would retain the wires in position, if anyone can shred some light on it for me.?