I think I know, but I'd better check and be sure. Oil hole: top or bottom?
Top or side. Bottom would be a big leak! I always put them at the top, my dad always put them at the side. If you have transmission screen they get lots of oil either way.
Bruce (RIP) said at the top, so that's what I do....
I don't think that bottom would cause a leak, but you need to get oil into the bearing. The top is best for getting oil to it, but also if it is quite loose, will leak more.
Ford manual reads at paragraph 329, 'oil end of drive plate shaft and insert ball cap over end of shaft with oil hole 'B' towards the top. (Fig 214)
The oil that splashes and slips down thru the clutch spring and inside the clutch spring support finds its way to that hole on top. That 4th main needs its oil
This one the hole was rebabit and mounted, the hole down, about four years ago, found it so a few weeks ago.
Play between the shaft and the bearing was 1.2mm (sorry don't have inch plates). Oil was too low in the engine and the first rod was gone. The oil was under on the car, real mess.
I replaced it with a roller bearing style fourth bearing.
Just for what it's worth