Lower Bearing....
NEVER EVER USE GREASE IN A SLEEVE BEARING!!!!!!!
Got your attention?
Good! Go to your nearest hardware store and get some 3-in-1 MOTOR OIL. It comes in a blue bottle, and is SAE20 that is detergent free.
If you install grease, thin oil, or engine motor oil, kiss that motor goodbye forever! Anything other than detergent-free oil will destroy that bearing in very short order. Something like Zoom spout oil wont' work here either since you're dealing with heat and torque from the motor.
Use the right stuff and that bearing will last just about forever.....use the wrong stuff and it'll last about 5-10 minutes!