MANCHESTER, NH–Area grandma Betty Zall, 81, took her 1985 Buick LeSabre to the mechanic Tuesday, paying $55 to have the buttons on its radio pre-set. "Oh, I just wouldn't trust myself to crack the thing open and fool around in there," said Zall, who chose, among other stations, NPR, Lite 108, and a rock station for her grandson. "I'm sure something would go terribly wrong." Zall said her mechanic offered to show her how to pre-set the stations herself, but she declined, telling him, "I'm just no good with tools. I'd rather let you experts handle it."