Windshield wiper arm installation note

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Clean the serrated connecting part with a wire brush before installing the windshield wiper arm.

Fig 1: Cleaning Serrated Connecting Part With Wire Brush

Courtesy of MAZDA MOTORS CORP.