Recently, I found that the strings on my strat were buzzing a lot, especially the D and G. The buzzing was worst when I played open strings but not as bad (still pretty bad though) when I played elsewhere. I couldn't figure out what the problem was until I changed the strings and found that parts of the saddles had rusted. The strings had cut into the rusty part of the saddles and created a small trough of sorts. When I moved the strings out of the trough and into a part of a saddle that wasn't very rusty, the buzzing stops. My question is, is there anyway to fix this problem without replacing the saddles?