Yep - replaces one of those 2 screws (7 and 8) and screws on OUTSIDE. Its tougher than you think once screwed on, but agree care needed if left installed. My concern is that its a relatively small aperture into the camera for the desiccant to be acting, so I put some argon in as well.
At the end of the day both strategies would seem to only be as good as the seal on the camera chamber (there is a single large o-ring seal).
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