When Foss Maritime Company decided to regear tug Iver Foss, the choice to go with Lufkin paid off, as the company's replacement gears had been designed to fit perfectly in the space vacated by the gears being replaced. Marine owners and operators, like Foss Maritime Company, have always faced steadily rising repair costs and replacement problems, as a result of aging propulsion drives. In fact, some manufacturers' units are no longer in production, and are not commercially available. Many non-Lufkin units require new equipment be installed, because access to parts and service can be difficult for some older or discontinued models; however, parts and service continue to be available for all Lufkin drives.