Has anyone here ever used one of these? I just picked one up on eBay for $10.00, just to give it a try. Problem is, I don't know how to open it to change the light bulb. The safelight burns, but no bright light for exposing. Also, any tips on how to use it would be apprciated.

I am new to LF, and just purchased a Sinar F, with Rodenstock 150mm and 210mm lenses. I will process my on T-Max in trays at first. I was hoping to use this little contact printer just for fun.