casement windows: convert pushout stay operation to winder/crank
is it possible to convert my 1920's timber casement windows from their current pushout stay operation to a winder mechanism? The stay is attached to the middle of the vertical edge of the window and i think a winder would need to go on the base of the window.
I really want to be able to lock the windows open and to install a fixed timber flyscreen to the windows and can't with the stay operation as a) they dont lock and b) the stay juts inside the room when the window is open.
installing a winder/crank is the only solution i can think of but i am not sure if this is feasible. any suggestions on how to do this or alternatives would be great.