Need to limit opening to 4"

A quick learner from Los Angeles says:
Hi I need to limit the operation of these windows so that they only open 4 inches. I know you have a sash stop limiter. But it seems a little bit hard to install. Any other ideas on how this could be done?
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Casey from SWISCO responded:

Hello,

A sash limiter such as the 39-398 would be our best recommendation for what you are trying to achieve. Take a look at the installation video below if you haven't already. Thanks for posting. 

A contractor from IL says:
Hello, I wanted to make sure this will work for a Pella Builder Series Casement window
dated in 1979.
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Casey from SWISCO responded:

Hello,

Our sash stop device is not brand specific. As long as you have space on your sill to install the 39-398 as shown in the video in this thread, you should be good to go. 

How to Install a Sash Stop Device on a Casement Window [1080p]
How to Install a Sash Stop Device on a Casement Window [1080p]
VIDEO
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