I just received a nice Focomat 1c and noticed that the condenser did not lower fully to contact the negative carrier as it's intended to do. After disassembling the condenser assembly I found that the condenser still was not seating fully in its housing. The issue turned out to be a spacer ring in the housing which kept the condenser from fully seating. The spacer is metal and is about 3mm thick. It appears to be intentionally put there. I removed it and the condenser works normally.

Has anybody seen this before? What would it be for since it keeps the condenser from closing onto the film? I thought perhaps it might be used with the hinged double glass plate (because of the increased thickness), but there is no mention of it in the Leitz instructions.