Just moved in to a new to us home. It has a SunPorch brand sun room. I have been trying to find the manufacturer, and purchase replacement parts, to no avail.
Bottom wall panels are frames and clear vinyl and top frame consists of a vinyl window and frame that fits into another frame that holds the screen (the main panel, that holds the window panel).
The 2 frames are held together with 4 - 90 degree toggles that when toggled to 90 degrees compresses a rubber bushing's lenghth,increasing the width to lock it into place.
The hole is 1.4 cm, part assembly fits in, turn the toggle down 90 degrees which compresses the rubber bushing, and makes it wider than 1.4 cm and holds the window frame tight to the screen frame