Any wooden window frame with a single glass is easy to turn into a double, having received a kind of glazing is not worse than common now brand.
This will require a brace or composite rod-the glass bead and a slightly larger format than is setup in the window so that you can lay on the frame and press with rail, bothering and seal with a rubber strip or putty.
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To get out of the ordinary frosted glass, have it for a long time to handle with sandpaper or other abrasive. But there are less time consuming and easier way to achieve the same result....