(ps the note editor function isn't working for me so i'm sorry in advance for the lack of notes)
Step 1: Materials/Tools
More than enough elastic the thicker the better as long as it fits (at least 500mm/2' more than you need). (I doubled mine up as it was all i could find).
1 pair of Vice Grips.
A Knife/ Leatherman.
10 Minutes of your time.