DonnaC - I also have the Singer Quantum L-500 machine. I've been having problems with it the past week and it needs to get serviced. I called Singer and told them I feel like I have a ghost machine as there is nothing on their web site relating to this machine and the customer service rep agreed. She said that when Singer Viking Pfaff all became one the Quantum L500 too closely resembled the Pfaff Smarter C1100 machine and that Singer had to pull the machine. Now I'm looking for a Pfaff technician that might be able to fix my machine. FINGERS CROSSED.