The upper bellows on Beseler 23C enlargers, including the 23C, 23CII, and 23CIII, fits between the upper negative stage plate and condenser support stage, and allows adjustment of the condensers for different negative formats. If the upper bellows on your Beseler 23C enlarger is torn, cracked, worn, or otherwise leaking light, this is the correct replacement. The replacement bellows must be glued to the upper negative plate and condenser housing support plate.
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