The women at an Arizona quilt show told me that their rule was : Can a person on a galloping horse see the mistake? If they can, redo it. If they can't, leave it be. I kind of like that saying but don't always follow it. Sometimes I just have to redo the mistake. I'm not a perfect quilter and my points get cut off all the time. I have problems with my eyesight and this is the best I can do.