The replacement arms have splines that fit over the original splined stub shaft, and there is a spring loaded tab that clips against the stub th hold the arm in place. However, that isn't my issue at this point. The issue is how the wiper arm mounts to the wiper blade assembly. It is VERY wobbley and doesn't clip together worth a $£|¥! I can tell this setup won't make it long before the wiper blades go flying off. Wiper blades should only pivot in one axis on a wiper arm. They shouldn't be allowed to wobble like they're mounted on a pivot ball. As far as I'm concerned this setup is garbage, and they weren't cheap. $15 per blade and $15 per arm, plus tax and shipping makes for a pricy pile of junk.
