The 1/4" measurement will only work if your seams that you are using to stitch your binding on are are 1/4". For sewing on binding I like using the width of my presser foot for my walking foot which is more like 3/8" so I stop 3/8" and start 3/8". Since I almost always have a border on my quilts I don't have to worry about the wider seam allowance cutting off points of a pattern etc. The wider seam allowance also gives more dimension to the binding and the layers go all the way to the edge of the binding when it's turned to the back. You can use a note card, old envelope, any paper with a little weight to it to measure your seam allowance, mark the paper and then use that to mark your stop and start points. The stop point is actually more important than the start point as you can actually start stitching at the top and it will work.