Hi I have 3 windows that have I need to alter. I wish to remove the existing windowframe and install new frames with an opening at the top. I can remove the existing window without any damage to the main frame but do not know what to do next. could anyone advise on the best way to accomplish this.
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Existing window frame internal frame can be removed
-------------- ||-----------|| < opening ||___________|| |-------------| < new bar | | | | | | ---------------