Replaced furnace thermocouple

Now that winter is approaching, I finally replaced the thermocouple in our furnace. The universal thermocouple didn't fit so I had to go out and buy another one. Our 80 year old furnace uses a bigger screw-in fitting than the universal one. I ended up re-using the old fitting with a push-in adapter. It didn't work initially, so I had to force the thermocouple closer to the flame. It took me about 3 hours overall.