I managed to accidentally scratch the front element of my*Leica Elmarit-M 90 mm f/2.8 6-bit coded lens, Serial #3521137. *I contacted Leica and they no longer have that lens element available for replacement. *Attached is a photo of the lens & scratch. Does anyone have any suggestions for repairing this scratch? Perhaps buy an identical lens with a pristine front element and swap the front glass?*Any suggestions or thoughts you have will be appreciated.