Bobbin "thing" I learned yesterday
I was having problem with my bobbin thread skipping out of the tension channel and was at the point of taking it in for cleaning. One last try at cleaning out the bobbin area led me to notice that the bobbin case had gathered dust in the small diagonal channel where the thread was to have been - this dust collection prevented the thread from seating correctly. Using the point of a needle, I carefully pulled the dust out of the channel and it works perfectly....so check out that area if you have a problem with bobbin thread coming out of the tension area. And I was amazed at how much dust was in there and how impacted it was - came out in tiny clumps!