People sell or give away glass topped tables pretty often, and on some of them the glass just sits in a metal frame and can be easily removed.
Any reason this wouldn't work for window glass? It wouldn't be double-glazed, obviously, but I was thinking if you had two you could put one at each end of a wide windowsill (such as in an earthbag or cob house, with thick walls), have both the indoor and outdoor part operable, and use the space in the middle to grow pot plants or whatever.
I have used a stainless steel patch that is available to use on fibreglass shower booths when the taps are moved.
They are domed slightly, have a threaded stub bolt welded to the inside and a bar wide enough to go across the hole each dome is intended for.
With a washer made by myself they work great when used as a skylight or a window.
In the shower recess you dont use a washer.
John Daley Bendigo, Australia
The Enemy of progress is the hope of a perfect plan