The last time I went camping, I noticed my now-classic Sierra Designs Clip Flashlight CD—which is otherwise in great shape after all these years—had shockcording about as limp as a wet noodle. I suppose, though, that is not to be expected when I had first used the tent while Bill Clinton was still President of the United States. Shockcords elongate and lose their elasticity over time, and when that happens for a tent, it can be more difficult to assemble the tent poles as the flaccid lengths get in the way of inserting pole segments together.
So I just spent a good amount of time researching shockcording repair kits on Amazon (~$10 with shipping), and how-to-repair videos on YouTube. All that turned out to be entirely unnecessary. When I inspected my poles, I realized there was a much easier fix than replacing the shockcord altogether.
For my tent, I simply pulled the end rivets out of the pole ends with pliers as shown in the image above. That turned out to be connected to the end of the shock cording. I then assembled the pole segments together (all pieces except for the rivet I just pulled out), pulled the shockcord taut, tied a new overhand knot about 6″ from the original knot in the end of the shockcord (upper half of the image above), cut the extra shock cording about an inch from the new knot, and reinserted the rivet.
Basically all I did was make the shockcord shorter!
Easy peasy. It was simpler than holding a piece of cake in one hand while jumping up and down. My tent is probably good for another 13 years.