The part is called a retaining ring. You should be able to get a
new one from Schneider, I don't think it will cost much. They might need the serial number to determine the exact version. Schneider Componon enlarging lenses are excellent, even the older ones.
There is a ring on the back, the side that goes toward the light. The missing one is the one on the side toward the print. Is that also called a retaining ring?
--Shannon
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