I bought a 1972 Scotty Hilander travel trailer a few weeks ago. Within that trailer is the original Coleman propane heater/furnace. Apparently the previous owner thought the thermocouple was bad and removed it. They failed to replace the thermocouple before I bought it (the trailer). 2 questions....is it correct that the last 1/2 inch or so of the thermocouple should be directly in the pilot? With the thermocouple directly in the pilot, the pilot has stayed lit a few times, but more often than not, still goes out after trying to light it. Could it be something else other than the thermocouple or am I doing something incorrectly? FYI, I hold the flame to the thermocouple at least a minute before switching the control to "on". Thanks.