I have purchased a condo that has double hung vinyl tilt windows. I do not know the brand or age of windows, my guess is more than 20 yrs old. None of the windows operate with ease and one is missing the locking device and the shoe is broken. Obviously the shoe and locking device need to be replaced. How do I know if the spiral balances can be repaired or should be replaced. Would adjusting tension on the spiral balances solve the problem?
Thank you for your reply.
Margaret