In the YouTube video in post #2 the Oslo owner cleans out by taking off the oval plate (at 4:15 in the video).
My comment: Don't take off the oval plate. Lift the take off the whole top. You'll have more access to inside of stove.
My comment from old thread:
Leave 3 bolts off top, but leave 2 bolts on oval plate.
It didn't take too long to unbolt top using 10 mm socket wrench (back bolt is a tight squeeze for fingers) but it was easier than I thought it would be from reading previous threads. It really makes it easy to inspect and clean blanket and tubes and access flue. Had a thick layer of very fine ash on top of blanket after 5 burning seasons. Jotul manual has scant maintenance info.
I've burned with top unbolted for first season with no problem. Top has a lot of weight to hold gasket in place. No need however to remove bolts from oval plate (If it ain't broke ...) - since top comes off anyway to access, the oval plate gasket slides around and is tough to set back in place, and there is not much weight to hold plate in place.