I have about a dozen double-hung windows that have broken sash cords. I know how to repair sash cords, but it is tedious work.
Is there any alternative, "quick and easy" way to repair the windows such that they can be opened again, at least partly? I'm envisioning, for instance, some kind of hardware that can be installed in the window frame to hold the windows open at fixed positions, then retracted to allow them to close again -- essentially, a user-friendly variation on driving a screw into the frame to hold the window up, then unscrewing it when you want to close the window.
If there is a way to tie broken sash cords back together, that would work, too. Most of my sash cords are still in place, but are cut.