I have a Kenmore with differential feed. I got material jammed down under the plate & couldn't get it to come out. Got mad & ripped it up out of there. There's a black U shaped piece attached just below the lower looper on the same stem & I broke one leg of that U thing off. What is that for & will it work still?

SOURCE: My 1034D serger has a broken part that holds the lower looper.

call brothers hot line 1-901-373-6256 tell them your problem and part no, if you know it if not they should be able to help you

SOURCE: Brother SE-270D Jams below needle plate

Comment by margecam52, posted on Aug 12, 2008 It's the bobbin thread. Also, it does not have to be Brother brand. Any 60wt thread will work. I get mine at http://www.threadart.com
They have it on large cones, and I use a cone holder to fill my bobbins. I have not had a single problem since. I like this thread because it has a sheen to it. I also have a longarm quilting machine & I use this bobbin thread 95% of the time. Also, be sure to check the bobbin area (remove the plastic & the metal plates) for lint buildup... I have a small, soft artists paint brush that I use to remove the lint build up with. I check after every embroidery run.
And for the thread not coming through...mine does it when I change thickness of threads. There is an adjustment wheel on the front of the machine, I turn that...seems to make the difference...not even sure that is what it's for...but it works for me.

SOURCE: feed dog switch

Did you turn the handwheel? The feed teeth will not come up until the machine is operated. Run it a few stitches and they will come up.

SOURCE: Feed Dogs Kenmore 158.19802

I think the feed dog lever needs to be positioned on the right.

SOURCE: looper problem on 14SH644 Singer Ultralock Serger w/differential

try www.sergerparts.com there you can find a nice tutorial on how to set the timing.