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 I´m sure they won´t affect image image quality in any visible way. If that really worries you then you could sell the camera and buy a 903SWC. I´m watching the prices on Ebay regularly and upgrading won´t cost you much.