While I am reasonably adept at repairs I just don't have time to replace ropes and wights in several windows that won't stay up without a prop. I have been told that there is some sort of flexible spring steel bit of hardware that fits in channel that will hold window up. True or just wishful thinking?
Paul from SWISCO responded:
May 22, 2013
We may have something for you. Check out our 20-001 Wood Window Sash Tension Spring. Is this what you're looking for? Let me know what you think.