Nikon DK-23 Rubber Eyecup
Canon CG2-1817-USC Battery Cover
Beseler Shoulder Screw 540-30-46
Genuine Beseler shoulder screw for the 23C, 23CII, and 23CII XL enlargers. #35 0n the exploded view. Made by Charles Beseler USA. Exploded views for the 23C can help you find the part you need.