Hey, folks. This is my first post here, so be gentle. I recently acquired an older Beseler 45M enlarger from my boss (I work in a local camera shop) for cheap due to her moving; said enlarger sat in a workshop attached to the house for probably 10 years without being used. Consequently, it needs a lot of work. I have a web gallery up of photos documenting my progress, they're in roughly chronological order. Everything's functional except for the polycontrast filter head. The filters are faded and in pretty bad shape. I was thinking I could just pop the case open, take the filter holders out and replace them with a new set of Ilford multigrade 6" filters (which I use with Ilford paper). The problem is that the case won't open. I've taken out all of the screws I can find, and I still can't figure out how to get it open. In the picture below, there's a screw in the top-right corner that looks like it was put in upside-down. I'm thinking I may be able to grind it out and hopefully get the case open that way. I've done a web search as best I can to try to find more information on this particular head; I don't know if it was a Beseler item or a third-party item. The original owner is long gone, and my boss' husband (who owned the enlarger) bought it used 25-some years ago and never messed with it. Does anyone have any information about this particular head, or know if replacements are available? More pictures of the filter head can be found here and here. I'm also wondering what this little guy is for: The rusty bit to the left of the lens board... I don't know if there's supposed to be something else there that I don't have, or what.. but I'm totally stumped. If anyone has or knows where to find more information about the original 45M, I'd be grateful. Thanks in advance!