It's a satisfyingly easy, five-minute job.
Use a 14mm wrench to remove the locknut on the backside of the
shift lever; you'll see it at the mid-point, where the lever
pivots. Or, use the same wrench to loosen the chrome bolt from the
front. I used two 14mm open wrenches: one to hold the bolt, the
other to turn the locknut.
When you remove the bolt and locknut, you'll find a cylindrical
bushing; it inserts on the back side of the shifter. Smear the
inside with grease, and reassemble. That's it.