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 … FacebookTwitterPinterestLinkedinRedditWhatsappTelegramEmail