Seating the rear derailleur cable housing Unpacked road bike. Assembly is simple enough, except that the rear derailleur cable housing is not in its groove (I'm sure there is a specific term).

Here is a picture.



No matter how much I tug (manually), the lower part in the picture—whatever it's called, housing endpoint?—will not fit in its seat, or "groove".

The brakes need no adjustments out of the box, and so I'm assuming the derailleurs are likewise already tuned and I don't need to disassemble, say, the screw holding the end of the cable near the cogset.

What's the trick?
Set the shifter to the slackest/highest position.
With the bike's rear wheel off the ground, put one hand on the body of the rear derailleur and push while turning the cranks with the other hand.
Push the derailleur until it shifts all the way up to the biggest cog and let go of the cranks and the derailleur.
Put the ferrule in the housing stop.
Turn the cranks a few times to let the rear derailleur return to the smallest cog.