I am the original owner of a Hearthstone II circa 1981 (yeah, the caveman owned this model, built just after fire was discovered). Anyway, I need to rebuild the internals that have deteriorated over the years (damper etc) how do I go about taking the stove apart. Where do I start? Stove is in good condition except for the internals. I have a steel fabrication background so the fabrication of the parts is the easy part for me. Just need to take the stove apart ....correctly.