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It is very important that you have the correct tension when you sew to ensure the seams will not come apart. Different fabrics will require different settings, so always test the machine tension on a scrap piece of fabric before sewing the garment. When setting the correct tension, it may be helpful to thread the machine with different color threads to better be able to see where the top and bottom stitches link together.
To adjust the tension simply move the tension dial to a lower or higher number. The tension dial determines how much thread is being fed into the stitch; too much tension results in not enough thread, and not enough tension results in too much thread being fed through.
When you have the correct tension your stitch links, (where the top and bottom threads are joined together,) will appear midway between the fabric layers. The stitches will be even on both sides of the fabric.
When you have too much tension, (a result of not enough thread per stitch,) the fabric will pucker, and stitches may be uneven. Also the stitch links will appear near the top layer of fabric. To fix the problem turn the tension dial to a lower number until you have the correct tension.
When you have too little tension, (a result of too much thread per stitch,) the stitches will be loose, creating a weak seam. The stitch links will appear toward the bottom layer of fabric. To fix the problem, turn the tension dial to a higher number until you have the correct tension.
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