Just bought my daughter Jupiter 711 as she had worn through a couple of keys on her Student Yamaha (I can`t complain that she doesn`t practice!)I thought getting an all silver flute, meant exactly that but apparently the keys are plated. Is there anything I can put on the keys to stop the plating getting worn? Also...she is having trouble getting the low C...her teacher has checked the flute, says it`s pads look OK but that the low C certainly is very difficult to get (no problems getting this note on her Yamaha). Does anyone know if Jupiters have this trait or whether this may entail a trip to the workshop? Would be grateful if someone could point us in the right direction. Thanks