I have an old Marlin MR-7 in 30-06 with a jeweled bolt which must have sat unused for a long time because the exposed portion of the bolt now has a dull appearance compared to the rest of the bolt. There is a straight line where the bright and the dulled portion meet. Is it possible to polish the entire bolt back to an even shine without ruining the jeweling or, would the bolt have to be polished and re jeweled? Thanks!