What's a good link (or book) that shows how to replace old steel frame windows in a concrete block wall?
The links I found on Youtube show how to replace modern windows where you can detach the window from the casing that has the flange. Those directions don't apply to old steel frame windows. The frames of these windows have a flange that is an integral part of the frame and this flange is set into the concrete block with mortar. You can't detach the window from the flange. I understand to tear out the old window along with the flange, (This is a destructive process! The frame and flange are about the same gauge as typical angle iron. They don't come out of the masonry easily.)
How should the replacment window be installed? I once watched the process from a distance as this was done on a house across the street. It appeared that the carpenter made a frame of 4 boards that snugly fit the masonry opening. He then installed the new window in this framework. I'd like to see plans that show all the details of that type of work. One consideration is that you've already lost some of the opening by putting the framework of boards in. What's the best design to preserve the part that's left?