I am new to the forum and have learned a lot already. I just bought a fisher Mama Bear and have a question about the draft caps. The stove is in pretty good shape but the draft caps are froze up tight. They are the 4 fin ez spin caps. From what I have read the bolt is double nutted on each side of the door and the cap just turns on the bolt. Is the door also threaded and are there any tricks to get the cap to turn freely on the bolt? Thanks