I have an Elna eXcellence 760 and I have a tendency to sew too fast when in a hurry to finish a project. I just got it back from the sewing repair shop 4 days ago. An $89.00 repair that has taught me to slow down as I sure don't want to go through that again. The thread had somehow hooked around a large screw on the bar that runs up and down while sewing and that screw was jammed tight full of thread. The repair man advised me that slowing my speed would save me that kind of cleanup again. I was very lucky it was not worse! My most expensive machine and will definitely take better care in my use of it.