One thing I'd really like to get is the motor bearing for the 40x /50x series. I don't know if I need one, but there are a couple I think may be louder and noisier than they need to be. (Of course it could be that the 411 is just that much quieter.) My supplier doesn't have them though, Jenny does, but I have so little to order from her now.
Have you changed one out? What noises went away? Does the gear that turns the fiber gear still pop up and down as much when it starts?