I have a fan limit switch that is not functioning properly. It stays on. The normal honeywell looking switch with probe does not fit. When pulled out it looks very different. It has 2 lead screws (adjustable) leading into 2 backward C looking pieces of metal. I have pictures but can not post them to you for some reason. How do I fix this or find this rare part to replace it. The furnace has always ran great. I just need to get this part fixed or replaced. Any suggestions?