I have a Harman PC45 that we have been using occasionally but want to use it more. The stove has burned out the igniter for the twice in 2 years. The air pump blows lots of air. This stove is new to me and from the first time I replaced the igniter it just slides right out. I thought at first we that must be how this works but now I am wondering if it does thread in and cannot maybe it is not in the tube at the end and restricting air flow. What would be involved at getting at those threads to clean them up or run a tap through them?