Jean A Ma Jig / Hump Jumper Oak Fabrics $4.95 Default Title - $4.95 Quantity This product is currently sold out. Please fill in the form below if you'd like to be notified when it becomes available. Use for top stitching and hemming over thick seams! Prevents skipped stitches and broken needles. Use on jeans, jackets, bags, etc. Works with any machine! See tutorial here.