Ive got an old Duo Therm furnace without a blower fan (gravity furnace?). The pilot won't stay lit. I am questioning the position of the pilot/thermocouple. As is, the thermocouple is about an inch below the pilot. Holding the pilot button down, the flame never touches the thermocouple, at closest about a quarter inch away. I tried the pilot adjustment screw, but the flame never gets any closer. Shouldn't the flame make actual contact? If so, are the two reversed in position? Should the thermocouple be above the pilot flame? Or should the flame reach down far enough to touch the thermocouple?