I have a habit of having minor problems with my glasses all around the world. Without fail whether it has been in Australia, Asia or Europe, when I go in to get a screw tightened or an adjustment made the optometrist will never take any money. It's like they have a creed that they assist each others customers. It’s a great concept and makes me respect the profession. Do you have this sort attitude in your business or are you chasing every last couple of dollars without thinking about the outcome. If you charge someone who is already a customer for something that takes a couple of minutes there is a good chance they won’t remain a customer. Sometimes in business its the little things that make or break it.