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When Dedham-based interior designer Christine Tuttle was approached by PBS’s “This Old House” to take part in this season’s project, she didn’t hesitate. “I’m a woman of action,” she said. Tuttle was brought on to the team for an update and expansion of an 1872 Italianate Victorian home for a young family of four in Arlington. The season, starring host Kevin O’Connor and general contractor Tom Silva, airs on Thursdays at 8 p.m.