SWARTSELL: He deftly moves the glass tube from the flame to check it against a paper pattern for a neon clock face. It's right on the money. WARTMAN: And I'll let it just sit here for about 10 or ...

He quickly and deftly moves the glass arc from the flame to check it against a paper pattern for a neon clock face. It's right on the money. "I'll let it sit for about 10 or 12 seconds," he explains.