If you look at the first photo below, you can see that absolute mess I made trying to edge my otherwise beautiful lawn with a string edger. Lawn edging is something that I have never been able to do well. Well, I solved my problem. I removed the guard from the edger. Now I can actually see what I am doing, and have been able to do a good job, if I do say so myself. If you also choose to remove the trimmer guard, you must wear eye protection. I would also suggest that you floss your teeth when your edging is finished.
Stan, The Much Improved Man