Just spoke to one of your helpful service reps. about how to ID the correct replacement springs for my windows, and she suggested I post here to get some feedback. I have two different size windows where the springs have crimped in the tracks. They both are dual-coil on each side of sash, with rounded ends that match image of the S190 series shown on site. However, I can find no stamped numbers on the pieces I removed from windows. The coil width is 1/2".
Both windows are double glass I believe, and I removed and weighed one (approximately) at 15 pounds. Used your estimating guide as back-up for this one, and for 23.5" x 31" sash, double strength, it gave 16 pounds... so 16 it is. The other window sash, which I did not remove, is 27" x 23.5", which gives about 14 pounds.
My conclusion from this is that I need S190-440 coils for both of these windows... is this correct? Your site recommends "Replacing both window balances at the same time ..."... does this mean you recommend replacing all 4 in each sash if only 1 has broken?
