It's amazing what one finds rooting around in old boxes. I sold my Beseler 23C and what I thought to be all the accessories about 7 years ago when I purchased a 4x5 enlarger. Today I discovered this "negative" holder for 35mm slides. It's the older style with unfinished aluminum, i.e. not black, and has no problems. $12 postpaid in the US. International shipping is probably not worth it, but I'm game if you are.