Gary, this is a great investigation you are pursuing. I'm guessing milling the oil scroll on the shaft may not be a simple or inexpensive mod. Curious to see what your brother says.
By the way, this is a common technique to keep oil out in lieu of a seal. Seen here in the Citroen 2CV engine on the camshaft where it simply sits on the case without any bushing or seal and it effectively keeps oil from escaping.
By the way, this is a common technique to keep oil out in lieu of a seal. Seen here in the Citroen 2CV engine on the camshaft where it simply sits on the case without any bushing or seal and it effectively keeps oil from escaping.