For years I've been buying "Snuglets" and using them on my magsafe connectors to make them more secure. http://www.snuglet.com/ They are a cool little product making the cable less easy to pull out but still able to come out if pulled a bit harder. On probably a total of eight or more Macbooks over the years I've never had the cable pull the jack too hard or have the cable break. Highly recommended...