Our home is 40 years old and we have aluminum windows with a rolled steel rod on both sides. These rods are thin metal and then have a long spiral coil inside that in some way supports the window in any position.
These rods are now worn and galded so the window move hard and in small jumps.
Looking to replace these support rods. The rods are maybe 3/8" in diameter
Bob from SWISCO responded:
October 20, 2020
Old aluminum windows with 3/8" diameter rods often can use our Series 400 Spiral Balances as replacements. Let me know if you have further questions, and we'll do our best to help.