Before you can even begin to install the trim ring there are three steps that need to be taken.

The first is to actually clean the trim ring as stated above. The second, pictured, is to wrap butyl around each of the trim ring studs. I found out the hard and messy way that you do not want HUGE globs of butyl around the studs or it will squeeze out the top of the trim ring and make for some messy clean up. I actually re-did my first port because of this.


Seeing as I countersunk each hole I wanted just enough to fill the bevel and a touch more, that's it.


To make the butyl thinner I simply rolled it between my fingers while pulling slightly at the same time, like you would do with a joint, If your not familiar with this action a visit to any college campus will teach you. I then cut it using a knife and a silicone cutting board and wrapped it around each stud.