I bought an old Kay bass last summer and am starting to get it fixed up. The tuners are somewhat rusted but I think they can be cleaned up. Most Kay's I have seen on ebay seem to have brass tuners, and I am wondering how common regular metal tuners were. What is the original appearance? How should I approach this....clean them up or try to get a brass set? Would that ruin the value of a vintage instrument? It is an old C-1 model...1957 if I remember correctly.