The mod as a whole was advertised as improving low altitude performance, although it also included a new parachute and a gas bladder to push the parachute pack out of the headbox more quickly. I couldn't say what the advantage of the gas shackle in isolation is supposed to be. What I do know is that the shackle link and the offending bolt are still present, and can be "wiggled" if desired to check that the link hasn't been clamped onto the shackle.