Thanks for the how-to help!
When I"m here, I am amazed at the complexity of old machines I thought were so basic...reading up on the quirks, fixes, and solutions is interesting, and because of all of you...
Last night I finally got my serger (a mid '90s hobbylock) to fly again. It's been breaking the needle threads, the left needle doesn't always catch the looper, etc.
First, I rethreaded. Then I changed the needles & reset the needle height. Then I oiled as directed. No luck! Then I started pulling on those needle threads, and they were really balking. Turns out they had twisted around each other two or three times behind the major front guide thingy, before traveling down to the thread guides above the needles. Voila! Fixed. A good lesson learned, and one I didn't discover sooner because I always tie on the thread and sew through, rather than restringing each one separately. AND I learned that threading the left looper is infinitely easier when the knife is out of the way.
Thanks!