Try changing it when changing stitch length. You never know until you do it. I change tension all the time. I want to know what too loose and too tight look like with different threads. Machine tension is set for one type of thread at the factory so you have to adjust it. I don't know why so many sewers are afraid of that tension dial upper or lower.
FYI: I was taught to always raise the pressure foot when adjusting tension. I do this on all my machines, new and vintage.
Last edited by Onebyone; 07-17-2015 at 03:54 AM.