I've owned my Stingray5 for nearly 9 years, but I did get it used. I've noticed that some of the pickup poles are higher than others, particularly the top pole that corresponds to the "A" string. I don't recall seeing this in other SR5s I've seen. Was this some sort of custom setting? Should I undo this somehow and make them all level? also, my pickup poles seem to be dirty/rusty around the edges. What's the best way to clean this? I've heard of this metal cleaning creme sold in hardware stores where you apply and simply rub off. Would this be damaging to the plastic in the pickup housing?