I did another inspection and cleaning this past spring, so I can post pictures and description when I get the time (sooner than seven years this time.) It was not much different from the first inspection, though the perlite-clay riser is getting old. There was not enough ash buildup to obstruct the bell exit.
Every time you till, you lose 30% of your organic matter. But this tiny ad is durable:
Escape to gardens and natural buildings (for free-ish) in Montana