I'm pretty sure this has been covered before, but it just came up today.  I am rebuilding a set of 1957 Ford Rockers and shafts.  I took everything apart for cleaning and there are no scored or worn parts.   When I took them apart I noticed that the shaft ends were plugged with tiny freeze plugs. I have done this before myself, but I was not aware this was done from the factory.   They are the good ratio rockers and look to be original. Also, they had the little tubes on the ends to direct the oil down the hole in the head.  My question is: Do I need the little tubes?   I can see the tube keeps the shaft from turning which could block the oil feed to the upper end.  I had a few YBlocks in the day, but don't remember the tubes being there.