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We are going to open three windows in the existing western wall. Here is a detailed video documenting the opening of the first window.
Also take a look at Needle Beams, a safer option when opening larger windows: kzfaq.info/get/bejne/eZiFga15zd7JiKM.html
Working with heavy stones, and opening a window is dangerous. Do not try this at home. Ask a professional to do it.