metal roll for window broke

Question

We're not sure of the age of our windows, moved in in 1984, replaced windows, say 1990, the metal roll on the left side broke, I think the roll on the right side also. The number on the metal roll is 335ks. Also will I need new parts or does the new parts work in these older windows? Thanks Mark.

Paul · Accepted Answer

Many thanks for writing in. It looks like you have the old CertainTeed coil balance system. The 3/4" wide coil spring marked 335 will be our S170-335 5 pound spring. If the old pivot shoe is undamaged, you could reuse it--otherwise, see our 15-192.