Brian,
Both my mags leak some oil at the bottom center where they join the engine. I don't think it's the stud leaking. I recently removed both for their first 500 hour servicing, then re-installed with new gaskets (dry) after cleaning thoroughly. Same thing.
I've been told I should have greased the gaskets?? Also noticed there are several "styles" of gaskets available.
So I, too, need the experts advice.
John