Back in the day you could snag a busted Retina IIIc—usually with the film‑advance rack stripped—for about 20-30 bucks. Micro‑Tools used to sell the replacement parts, but no longer does. Beljan made special tool to remove the lens, not easy to find. The Rodenstock version pops up less often and costs more, but I’ve never seen a good reason to pay extra for it. The Schneider lens is already fantastic for sharpness and color.