Is the shield on the Zamp RZ-67D easy to change between heats? (Helmet Review: Let's Dive Deep into the Zamp RZ-67D Graphic Helmet! — FAST RACER Helmet Review: Let's Dive Deep into the Zamp RZ-67D Graphic Helmet! — FAST RACER Helmet Review: Let's Dive Deep into the Zamp RZ-67D Graphic Helmet! — FAST RACER Helmet Review: Let's Dive Deep into the Zamp RZ-67D Graphic Helmet!