Dave Sr. from SWISCO responded:
April 26, 2017
Hmm... first, try to slide the roller housing out from the end of the sash rail. Maybe that would be a better way to remove them. You might need to take part of the window apart to do this, but it depends on what your window is. You may want the help of a local professional to do this, as it can be a project. You don't want to damage the frame or glass on accident.
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