U-joint vs pot coupler

is the reverse switch plastic post (part number 2880948 for '67, 2883211 for '68/later) that is one-use
If you have the column out of the car and the steering shaft out you can gently tap the lock pin of the plastic actuator into the column. Then with a little heat up into the tube GENTLY wiggle the actuator pin out.

The actuator locks in place like a drywall anchor