There are SO MANY sewing tools in the world that are generally unnecessary (though often helpful) but this one is a great sewing hack- a seam jack or my pref
Using a Seam Jack & How to Make Your Own for Free for Sewists
Stitching Stuffies #3, Pack Memorial Library, Haywood Street
British Sew-a-Row Part 4: Afternoon Tea Row - The Crafty Nomad
How to Make an Outdoor Quilt: Your Guide to Canvas - Suzy Quilts
Back to School Blog Hop… Change that needle! – Catherine Redford
How To Sew 8 Common Seams
Paisleyandglue
FREE TUTORIAL: How to Sew Key Fobs
She's A Sewing Machine Mechanic: How To Use a Seam Jack