i need to replace the thermostat assembly on my Vermont Castings Intrepid I wood stove, but I cannot figure out how to remove the old one so I can replace it. I have looked inside the stove to see if it is attached with a nut, but it is not. I have turned the handle back and forth and pulled on it, but it will not come out. How can I remove the old thermostat assembly? Thanks for any help you can give me.