I just had to have my Huskylock 936 serger serviced for a loud squeaking noise. Turns out it needed a new bearing in the area above the needles. The tech told me when he opened it up it was "just full of junk"...because I had never cleaned and oiled it there!! I didn't even know you should....wasn't in the manual!!. My model has a screw on the left side of it to enable you to remove the cover so you can access this area of the machine. He's instructed me to open this area and clean and oil it as much as I do the rest of the machine....oil every moving part. The new bearing cost me $79 in parts and labor....so hopefully this will help some of you other serger owners out there, too.