I bought a Super Chromega E last September. I want to use it for 5x7 negs, but it came with a 150mm lens. I found a 210 Componon (non-S) on ebay cheap so I bought it. I then realized I needed a larger mounting cone than the one I have for the 150mm lens. Plus a lens disc and flange. I had no idea what I was getting into. So I found a place that could manufacture these 3 items for me. I'm still waiting, and am doubtful it'll ever happen. I found the cone at B&H, but by special order only (pay now, no refunds). They don't have a lens disc large enough, but they have a blank one (also special order) I could get a machinist to cut for me. They have no flanges at all, and I can't find one anywhere. A post on here, and careful measuring with a ruler (I don't have calipers) determined that my lens has a 60mm thread. I'm wondering if I could get a 60 to 67mm stepping ring used for filters and use that as my flange/retaining ring. Any input would be *much* appreciated on how I might get this to work. I've been staring at this thing for 6 months and really want to use it, but I'm in a little over my head and parts are as rare as an honest politician.