I am very happy making masks with my new Singer. However, I can't get the thread tensions to be equal, and suspect that issue may be causing the mild to severe thread snarls I am often getting. I tried to follow the directions to make adjustments. But apparently I have failed. Which leads to a much bigger issue. I had to print out the English pages of the machine manual and staple them together in order to have them with me at the machine. I might have missed some pertinent pages. Would it have really been too expensive for you to include a manual on how to operate this fairly sophisticated piece of equipment? On a happier note, I just ran a dart through a jeans waistband - no problem! Awesome!