window coil issues

Hi there!

I'm afraid the parts you picked out aren't compatible with your old springs. Your shoe is no longer available but the 15-177 can replace it. The compatible springs are the Series 152 which are designed to use the 15-143 bushing, 15-144 bushing cap, and 15-145 barrel. These parts "sandwich" around each spring. 

Since the sash is 13-pounds, you can use one S152-7 7-pound spring on each side of the window. This will total 14 pounds of overall support which should be fine so long as the coil weights total within a pound of the sash's actual weight. 

You're too kind! I'm happy to help.

We don't have a video or graphic but I'll try to explain it as best as I can! Lay the 15-143 bushing flat on a table, place the 15-145 barrel inside of the bushing, then you'll put the coil spring over the barrel. The 15-144 cap then snaps onto the 15-143 bushing to sandwich the spring. I hope this helps!