The hook or shuttle point must be able to catch the thread loop formed during the upward stroke of the needle . If the loop is too high or too low, the hook will miss the loop and you will get a missed stitch. ... This can cause missed stitches, puckering and needle damage. A longer needle may also hit a part of the machine on its downward stroke. Press the needle position button once or twice. This will raise the needle to avoid getting in the way and ensure safety. Turn off your sewing machine. Make sure you unplug the power cord from the power supply. Now, raise the presser foot to remove the needle, presser foot, and its holder. Then, remove the flat bed attachment. Re-thread the upper part of the sewing machine making sure the thread is passing through every single thread guide on its way to the needle. Your sewing machine manual is the best guide on how to thread your particular sewing machine . Always thread the machine with the presser foot up. As long as the presser foot is up, the thread can seat.
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