AC Syndicate -107 WW1: Helix glitch under Tower Bridge

Com'on! I hate this so much! I hate the person who placed this glitch there, and I hate collecting this kind of collectibles for nothing good! The video shows the ONLY way to touch that helix glitch. I've tried 30+ times, trust me it's sucks... https://store.playstation.com/#!/tid=CUSA02389_00