How to remove Sash Stop Device on a Casement Window

We don't have a video on how to remove the 39-398, no. You would just reverse the process shown in the video. Where exactly are you running into problems?

Thanks, Eva. If you wanted to remove the whole thing, you'd just unscrew it. If you only wanted to disconnect the arm from the bracket, you have to first snap that little metal clip back with a screwdriver. That's called a "detach clip" and it's what holds the arm to the peg on the bracket. Once that snaps back, the arm will come loose and you can open the window all the way.