New turn for 'Click & Clack' and PBS Most TV series are propelled into the world by creative vision, ambition, all-out effort, and dreams of market domination. With "Click & Clack's As the Wrench Turns," the upcoming PBS cartoon featuring "Car Talk" stars Tom and Ray Magliozzi, it took something else - a whole lot of cajoling. Cajoling the proudly indolent Magliozzis into believing that a series about themselves would require minimal work on their part. Cajoling PBS into buying the concept of an animated show for grown-ups. And now comes the real trick: cajoling PBS viewers into sampling a...