Hi, How often have you taken your faithful sewing machine in for a tune-up? I have had my Singer for over 15 years and it has been sounding kinda rough and noisy. After a long time of procrastination, I took it in to my local sewing / vac dealer. They charge $59.99 for basic tune-up and adjustments. Does this sound like a fair price? She said it sounds like a gear is broke. Then it wouldn't be worth fixing ; but they would sell me a new one. Just how long should a machine last?