I was sewing many, many ribbon sash for dresses the last few days. I used to have issues with getting the top stitching on the edge of sash, camera strap cover or any straight edge even, without any derailment. Yes it can be done using the regular multipurpose foot, but I struggled and the results are never good enough.
Then I remember this blind hemming foot that comes standard with any sewing machine. I had never used it before because obviously my sewing repertoire is not large enough to include blind hemming anything hahaha...So, after some trial and error, I discovered that this foot is great at keeping my edge-stitching straight and even. I took a few photos and prepared this tutorial for some kindred souls out there who might need this as much as I did. Enjoy!