Greetings to all,                            I am having problems with my new (to me) Singer 31-15 that keeps braking the thread all the time. I have been reading to see if I can figure out what's wrong with it, the upper tension is not working. I found this youtube video and at 4:45 on the video, he talks about the Singer 31-15 tension and how the Needle Crank lever should press the Tension release lever to push the pin that release the tension during the stitching cycle, that is not hap