Carl, your timing is about perfect, I was just talking to my Gun Pusher Monday about this very thing. I mentioned that I read Midway has the Happy Trigger on sale, and he grimaced like I'd insulted his dog. He's been putting off buying one to try out for years, I said I was thinking about getting one for my 375, of my five Marlins it has the WORST trigger I've ever pulled on a levergun. So I'm seriously thinking about trying a trigger job, and if I screw it up, I'll just order the Happy Trigger to replace it.
What kinds of stones did you use? Any problems getting the trigger plate or the trigger out of the housing? Anything to watch out for? I've torn down all my Marlins to bare bones for cleaning, but never dismounted any of the triggers......none of them ever needed it until I got the 375!
If you took any pictures, we could make a How-To Thread, maybe even a sticky.