Trying a new stitch. Not bad. It locks when I finish the last stitch. Otherwise it is easy to undo. Happened when I messed up. Had to start over.
As I'm working on the butterfly, I realize it didn't totally lock the last stitch. Needed to go back and lock with a stitch, the last 2 corners. Making a note in my book. It's the 1978 Better Homes And Garden Embroidery.