I paid $100 for this Sierra stove and haven't fired it up yet. Above the side-load door is a lever controlling a flue gate. I can't find a manual online, though I did find technical data and a parts list for the much later S2300 model. Inside the stove, rattling around loose, I found the steel grate part pictured, which appears to have fallen out of the baffle section. I can't figure out how to reinstall it properly. Can anyone advise? Thanks!