Re: transom gasket
Both of the 2 bottom Studs are Aluminum,...... The 1s with the Anode in the end...........
Being a 1987 boat,.......
My Guesses are;
Either the Studs have Corroded to Dust,.........
Or,...
The Bottom of the Transom is Rotten,+ Collapsing, causing the Looseness..........
Boogering it up as you say you'd Like to do,..... Is a Step in the Wrong direction........
IF My guesses Are Right,.......
Your drive will be Out of Alignment,+ Things are going to start Breaking,.........
And it's Very Expensive Things that'll be doing the Breaking..................
And,.......... Yes,... Everything is Bolted from the Inside of the Transom..........