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While expanding his West Roxbury hot spot Rox Diner to a second location in Newtonville two years ago, John Fortin stumbled on a site for a possible third venture in nearby Newton Highlands. But at the time, his hands were full. After work was completed in November 2011, he and partner Paul Louderback revisited the onetime Bakers’ Best location and began designing a new restaurant with a slightly different name and what he calls “a variation on our theme. We’ve taken the basic values when it comes to our approach to cuisine and service, but we’ve narrowed it down a little bit to something that is not as extensive as our diner menus,” Fortin says of Rox Cafe, which had a soft opening on Lincoln Street last week.