Upper thing
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My suggestion now is to therefore use a permanent, METALLIC, factory pressure-fitted, 'Middle Ring',
that permanently holds the carto components in place, including the silicone inner cap which also insulates.
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Permanent, metallic, middle ring:
We appear to have suggested ceramic, and I heard something like 'it's used in atomizers', so I see no excuse NOT to use a permanent metallic middle ring. Those are ALSO used in atomizers. I once bought one or two atomizers, and on those they appear to be called 'washers'. That's what the XL needs to permanently hold the silicone insulating stabilizer in place. The only thing is that this XL washer, or ring, would have two small holes lined up with the silicone cap's holes.
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