I just got a '61 Gillette Super Speed from my grandfather. As it used to be his, it is quite clean, however it has some lost plating and pitting on the doors and the safety bar from use. First, this will not harm the razor's performance, correct? Second, is there anything I should do to preserve the plating left, and the bare metal areas? Third, if I were to have it replated, about how much would it cost?