Very nice work! I question the epoxy. Is it removable? I think the metering needle in the fuel/air tube could have simply been filed down a bit to achieve the desired result. I highly advocate torch burning generators to clean them. Why was it necessary to remove the graphite packing? I have also worked on many 400 series stoves. The original 400 and these 400A are my favorites. I try to tell people that when the burner is orange hot, the flame will appear orange as trace minerals from the metal off gas. Great, detailed video! Thank you.