Dave
TS Founding Member
Nothing. They have always had them for the most part. I don't get it myself. These 'rattles' for the most part, have always existed.
The Mack rattle comments came about because weirdly the oldest Mack hyper (Bluefire) didn’t have it, and people were surprised when rides such as Helix opened and it did have the rattle.
It doesn’t impact ride experience though.