As far as I understood you do not have scratches yet but you are concerned that scratches may show up? Do you still have the old SWC/M with the C-style lens? If not then there is no reason to worry at all. Even if there would be scratches Im sure they wont affect image image quality in any visible way. If that really worries you then you could sell the camera and buy a 903SWC. Im watching the prices on Ebay regularly and upgrading wont cost you much.