Product Description
Hemline Hump Jumper Bulky Seam Aid
The Hemline Hump Jumper—also known as a bulky seam aid—is a small, hard-wearing tool that quietly solves a common sewing problem: stitching smoothly across sudden height changes. When a presser foot tips up against a ridge (think jeans side seams, layered bag bottoms, quilted joins or thick bindings), feed can stall and stitches become short, skipped or uneven. The Hump Jumper levels the foot so the machine can advance fabric evenly, protecting your needle and preserving stitch quality.
This U-shaped aid offers two working thicknesses, one at each end, so you can choose the height that best supports your foot on the approach to—or descent from—a bulk. Slip the tool under the back of the foot as you reach a seam stack to keep the foot horizontal; the needle continues to meet the fabric at a consistent angle and the feed dogs maintain contact. When you are coming off the hump, place the tool in front of the foot to bridge the drop and avoid long stitches as the fabric levels out. The firm moulded body is smooth and stable, designed to sit flat on the needle plate without marking fabric.
Quilters will find it helpful when crossing bulky seam intersections, or top-stitching over folded bindings. For bag makers and dressmakers, it is invaluable for denim hems, canvas straps, zipped pockets and areas with multiple layers of interfacing. The slot between the prongs allows you to sew right up to the needle while the tool remains in position, and it is compatible with all domestic sewing machines.
The Hump Jumper also assists with sewing on flat buttons. Position the tool under the foot so the needle passes through the central slot, and it lifts the foot to create a small thread shank—useful on coats, knitwear and projects where the button needs clearance.
Compact and easy to store, this is the sort of notion that earns a permanent spot beside the machine. It does not add speed or flourish; it adds consistency. When your work involves layers, texture or structure, that reliability is what keeps a neat line of stitches marching straight through the bulk.
Other Details
How Makers Use It
- Level the presser foot to sew evenly across denim side seams and quilted joins.
- Support top-stitching on bag handles, straps and thick interfaced panels.
- Create a neat button shank when attaching buttons by machine.
- Bridge the “drop” after a hump to prevent long, uneven stitches.
- Keep stitches consistent when attaching bindings or hems with multiple layers.
Practical Tips
- Select the narrow or wide end to match the thickness of the seam.
- Place the tool behind the foot when approaching bulk; move it in front when leaving the hump.
- Increase stitch length slightly on very thick areas for a balanced look.
- Stitch slowly and keep fingers clear; remove the aid before back-tacking.
- Store by the machine so it’s to hand for hems, bindings and top-stitching.
