this tip came from Fons and Porter...I like the way it keeps the intersection lined right up I'll try and explain it, line up your seams with seams going in opposite directions as normal and then put your pin like this / . pin head on right side of seams and pin bottom on left side of seam. when your machine comes down the seam allowance stop with needle down directly in seam and remove pin...continue sewing, works for me.