mazdatweaker
+1y
The hood needs to be down.
After you loosen the nut. . .DO NOT REMOVE IT.
Flip the arm up, away from the windshield. That removes the spring binding
Tap the nut a couple times with a hammer, while wiggling the arm of the wiper.
The arm is secured on a tapered shaft that has serrations on it. . .trying to twist it will chew up the serrations.
Once the arm pops loose, remove the nut.