Don't overthink this though. They dont need much attention, and even when they do it's only a tiny squirt.
This.
The propshaft on my 1986 car is one of the few original parts on the car, so it's done well over 100k miles. I've had the car 20 years and I can't have greased them more than 4 times. They are needle bearings and you don't want to put a high-pressure grease gun on them.
