Hello, I recently purchased a new Saunders 4550XL and ordered several negative carriers with it. For 35mm negatives I got a standard glassless carrier, and a carrier with anti-newton ring top glass. I also got a clear top glass that can be swapped in place of the anti-newton ring glass. I am displeased with the quality of the glass in both cases. There are small imperfections which can affect print quality, particularly in prints that have areas of uniform midtone density. These small flaws are immaterial when working with larger format negatives, but when enlarging 35mm every tiny problem shows up. Aside from the glass, the equipment is excellent. So ideally all I want is the same negative carrier, but with top quality optical glass (clear, and anti-newton ring if it exists). Are there people who do this type of modification work, or perhaps make custom negative carriers that will fit my enlarger? And does anyone have really high quality glass that can be used for this? I was considering even buying a B+W multicoated clear filter, popping the glass out of the ring and somehow using that as my top glass. Frustrated.