Husqvarna Viking OPAL 670 What is welting? Here’s how to make it a DOUBLE and how to USE it! by Elaine Theriault March 25, 2022 by Elaine Theriault March 25, 2022 Expand your piping skills on the DOUBLE! Learn how to double welt in a flash using the right accessory feet on the Husqvarna Viking Opal 670. Elaine Theriault finishes off the week with this easy-to-follow free tutorial that’s sure to expand your creativity! FacebookTwitterPinterestLinkedinRedditWhatsappTelegramEmail