Bought this little, POS revolver, .22 short circa 1870, nickled, engraved, ivory grips turning yellowish. The best of the cheap guns, but CUTE,, how do you look after the real ivory grips?? Loosened the screws,, is there anything else you can do to preserve them? This is the nicest, not the best , but nice,, also the nickled finish,, oil it ?? Any help will be appreciated..