Threading elastic through a casing using a safety pin is a simple technique. Here's how to do it:
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Attach the Safety Pin: Securely attach a safety pin to one end of the elastic. Make sure the safety pin is closed to prevent it from opening during threading.
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Insert into Casing: Insert the safety pin (with the attached elastic) into the opening of the fabric casing.
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Scrunch and Slide: Scrunch the fabric around the safety pin and elastic, then slide the safety pin forward through the channel. According to the YouTube video "Tools & Tips for Threading Elastic Casings," scrunching the fabric helps in moving the safety pin (and thus the elastic) through the casing.
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Continue Threading: Continue scrunching the fabric and sliding the safety pin forward until you have threaded the elastic all the way through the casing.
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Secure the Elastic: Once the elastic is all the way through, remove the safety pin and secure the ends of the elastic by sewing them together or overlapping and stitching them down. Make sure the elastic isn't twisted before securing it.
This method is especially useful when the elastic's length is significantly shorter than the casing length, as mentioned in the YouTube video.