In reply to iksander:
I've done this loads of times and you'll find the shock cord can be pushed through the poles with a sligt twist as you go.
Use the existing elastic as a guide for length.
1) Thread through first pole and tie off one end of the elastic to sop it pulling through..
2)Thread through remaining poles one at a time until the length of elastic is too short to go through the remaining poles without stretching.
3) Pull elastic tight and clove hitch the tensioned elastic onto something like a pencil. This should allow you to push the un-tensioned elastic through the next pole length. You can also push a big safety pin through the elastic to stop it retracting.
4) Holding on to the elastic slide the clove hitch off the pencil.
Repeat 3) and 4) until everything is threaded and then tie a knot in the elastic to stop it retracting.
It should be no more than a 10minute job.
Gavin
Post edited at 14:31