Learn how-to twin needle like a boss with Cheryl from Sew Can Do and then try out your new skills with her fold over elastic knit pants tutorial.
Having the right notions is key. If you're sewing knits, make sure the twin needle is a stretch needle (aka ball point).
Note: Tunneling (the bane of twin needle stitching), when there's a bit of a bump between the stitch rows, is more likely to happen with the needles are further apart, so choosing a narrower twin needle helps.
Start by ironing your stabilizer to the wrong side of the knit, right next to the raw edge. For a hem or cuff that won't get much stretch, like the pants shown here, paper backer fusible tape works great. For a neckband, collar or sleeveless armhole that will get stretched and pulled more, use knit interfacing (that's got some stretch to it) & cut into a 5/8 wide strip or curve in the length required.
Add the twin needle to your machine and load the threads. Some machines may want you to adjust the position of the needle or attach an extra piece to hold the second spool of thread - consult your manual for your specific sewing machine's needs. Note: the spools should be pulling from opposite directions.
Got the hang of this technique?
Put your new skill to the test with this tutorial:
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