Rear Wiper Arm replacement

I'm looking for instructions on how to replace the Rear Wiper Arm - not the Blade. It's the part that goes between the motor and the Blade, commonly referred to as the ARM.

The part is readily available, but I don't know how to replace it, does the rear spoiler/cowl have to be removed first? I can't seem to find the instructions anywhere online.

The part I'm trying to replace is pictured below circled in red, thanks.

 

Here's how to replace 4runner 5th gen rear wiper Arm.
https://www.youtube.com/watch?v=XEOH8F7VaZc

 

Bust the nut…

 

Thanks for the information. My truck, with 191K on it, had the tension spring rusted/broken, and refused to release the arm from the shaft. The mechanic gave up too. So since I had the new arm, I simply examined it, took some needle nosed ViceGrips, and unhooked the new spring and installed it on the old arm. I will, of course, grease it a bit to make sure this doesn't happen again. Problem solved!

On that video above, please note that if you had it in the intermediate "install new blade position," you will need to make sure the blade is in the parked position before tightening the nut. It was parked in the video, but someone might rush through and skip that step.

Thanks for the help, great video and pix!