As of 2003, Kirby is the largest source of revenue and profit for Scott Fetzer, with approximately 500,000 sales per year, about a third of which are outside the United States. In 2003, Scott Fetzer sold the vacuums to about 835 factory distributors, who in turn sell the vacuums door-to-door. As an incentive to new customers, Kirby offers the Service Center Vacuum Rebuild Program for original owners who have been registered with the company. As long as the customer owns the machine as the registered owner, if the cleaner needs repair, they can send it back to the Rebuild Department and have it restored to “like-new” condition. The company will completely disassemble it, repair or replace any worn Kirby parts, and sandblast, polish and buff metal parts back to a shiny “new” appearance. Internal components are also thoroughly inspected and repaired with Kirby replacement parts so that it will perform as originally designed. This is an advantage to the company, as they can evaluate product durability from actual use and make revisions on future models.