We bought a home recently. All windows in the den - 4 in number - have their bottom sashes not staying up at all: That is if they are lifted up, they fall with a bang offering no resistance at all to stay up. These are tilt windows.
It seems strange that all 4 windows in the den have this problem - it looks like something was not fixed right on purpose. The top sash of all of these windows stays up though without a problem.
I could see that there is a name - Fiberlux - written on the sash in tiny letters but nothing other than that. The sashes are very heavy and appear to be made of metal. Each sash weighs about 11 pounds 11 ounce. The spiral balance measures 17".
I'm not sure what the problem could be. I looked at the videos on this website and attempted tightening the spiral balance by turning it clockwise 2 rounds each time, but it makes no difference at all. What should I be replacing - the spiral balance or the shoe or could I fix this with some other adjustment? I know that the spiral balance is not completely bad because when I tilt the sash to take it out, the spiral balance holds it in place about half the way firmly and without dropping it (my last picture shows this). However when I make the sash straight again it just drops like a dead weight.
Appreciate any help with fixing this and also a link to a guide showing how to replace the shoe if that is what needs to be replaced.