Don't forget the guitar string...

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This ^^^ was the most brilliant idea I had ever heard! Makes any future teardown a snap!

But if it is an o-ring seal between the transom adaptor and the bowl, don't grease it, don't use Vaseline or any other petroleum based product. It'll eat that rubber alive. Use Silicone Lube (You can get small containers of it at Lowe's, Home Depot, etc, larger tubes of it from any Pool Supply for about $7. If you have a pool, it's the same stuff you use on the pump basket cover

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If it's just a bead of silicone, use a good marine silicone that comes in a caulking tube, not the Kitchen and Bath stuff........If the TA had a gasket to the hull, I wouldn't bother with a new one, Just silicone it on as well. Now the guitar string GT mentioned, before you Silicone bead around the bowl, wrap a Guitar string (round wound G string works best) around there, all the way around, and pull it through it's ball end at the top of the bowl, then stuff it up in there as far as you can, cinched tight. Then Silicone bead over it. If you ever have to remove the bowl or TA adaptor again, just yank on the guitar string, Silicone gone!

Can even remove the bowl without removing the TA most of the time!!
Ray