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Fleetwin, I thought the same thing about the case halve screws. So I just put sealer under the heads of them and tried to keep any sealer off the threads. I didn’t want them to be a bear to remove if I ever had to go back in there. I did cut the spaghetti seal a little longer as the manual says and I also ordered the thicker spaghetti seal as recommended by (this old outboard, great video on the procedure btw) then I put some extra sealer on the ends.
Putting sealer under the heads of the screws is surely helpful. But, I don’t recommend using any alternate spaghetti seal. Leaks through the spaghetti seal are almost non existent, unless it has been misinstalled, improperly cemented in place. The leaks do occur where the ends of the spaghetti seal butt up against the prop shaft bushing/bearing/seal carrier. An actual leak through properly installed spaghetti seal would indicate a distorted/bent skeg/housing.
I watch the this old outboard youtube videos also, very amusing. But, his techniques should not be taken as professional advice, he doesn’t even have a gearcase pressure tester…..