Folks,
we bought a house with 20 year old replacement windows. The original installer was Bristol Aluminum from Bristol, RI. They claim they have no replacement parts for the windows that were made in Smithfield, Rhode Island, by Riverdale windows and Door. The installer was less than helpful.... your website is terrific. i have only taken apart one window, as pictured, that is a double sided failure.
Many of the remaining windows sag, or are stuck, or have no balance tension. the glass has retained its seals, and the windows do not leak air. other than the problems with the spiral balance, i am happy.potential purchase - repair parts for four windows, plus the Charging tool