roof vent qustion

Hi all
My question is when you pulled the interior trim ring down or loosened
(sp) it to slide ceiling in was there any leak issue's. Did you use the same screws? I do not plan on touching the exterior part of vent at all, as to not break the seal. All I do is eat sleep and talk CT this is crazy.
My question is when you pulled the interior trim ring down or loosened
(sp) it to slide ceiling in was there any leak issue's. Did you use the same screws? I do not plan on touching the exterior part of vent at all, as to not break the seal. All I do is eat sleep and talk CT this is crazy.