you can remove with an adjustable wrench, open end wrench or a little socket set if you have one.Oh I see. Can I remove it with an adjustable wrench? Or does it require something else?
in looking at your video, the first portion and the last portion may have had something in the opening/screen/cross hatching of the cap. thats the inner screen that keeps the larger sparks from exiting the chimney. it was hard to tell for sure but i could see through one but not some of the others. i'm running out of suggestions.