Re: Grease fitting?
It's a conversion used on some "in the know" trail riders. They drill both the front and rear wheel hub and inject grease till it starts coming out the dust covers. I haven't dont it yet. I am going to. It adds a little weight but makes the wheel hubs so they never get any water in them again. As far as the neck goes probably not needed but it wouldn't take alot to do the crank hub either. The frame tubes could be blocked with expanding foam. Since there's not alot of pressure involved. I used foam to fill my seat post to stop moisture from going down the seat tube and getting in the crank bearings.
Put something FUN between your legs..