Red Sox manager Terry Francona spoke at length about John Lackey during his media briefing at 4 p.m. yesterday, discussing the changes to his mechanics made with pitching coach Curt Young and the productive bullpen session the righthander had in New York on Sunday. "I think Lack felt really good about himself after his side the other day,'' Francona said. "They've been working on some delivery things that all pitching coaches do. It's always a constant work in progress.'' A few minutes later, Lackey ventured into the rain and played catch with teammate Jon Lester.