Wool thread, on the other hand, is very thick and if you were to use it, you'd have to adjust your tension. All of these small details can wreak havoc on your project so make sure you’re detail-oriented when setting up your machine for a project.
If you’re getting puckers on a lightweight fabric, trying shortening the stitch length to 1.75mm. A needle that is too large or too small can also unbalance your stitches. Different thread sizes on the top and in the bobbin can throw off your basic tension settings. Pay attention to your needles, threads, and fabrics.
