Hello, I just recived my meochrom 3 colour head for my meopta opemus 6. I used it a few times and the bulb died, I ordered a new one. While I was disassembling the bulb chamber though, i realized I had a problem with the mixing box. There is a little window on the polystirene box that I figured it should be positioned to face the light bulb, but if I do so the top part (which is glued to the bottom part) is facing the wrong direction, I know that because there is a notch on one side that should allign with on the head part. I didn't notice it the first time and infact when I mounted the colour head onto the enlarger it didn't fit properly making it hard to secure it with its screws on the sides. Any Idea how to solve this? Is the box supposed to be glued to the diffuser? how can I un-glue it and fix it in its proper position? HELP!