Need your advice Pete. The Rangely ash door often is a PITA to close. The ash is cleaned out inside, the ash pan pushed in to the end, but too many times the latch won't shut. All when cool. Cleaned off creosote from the inner latch and the inside tab. Then graphite on the latch and tab which seems to help with some grease on the tab. No schematic or maintenance tips in the manual for the latch. Ideas ?