Side-Mounted Springs on Older Bolingbrook Doors

Extension springs lose their pull gradually rather than all at once. Both sides have run the same number of cycles, so when one gives up the other is measurably weaker than it was, whatever it looks like. Put a new spring beside a tired one and the door lifts unevenly, which loads one track, one cable and one set of rollers harder than the other for the rest of its life.

Pulleys and S-hooks get the same look while the springs are off. Pulley bearings seize, sheaves wear a groove that starts eating cable, and hooks open up under years of load. Those parts are small next to the callback they prevent.

Not every extension door needs converting and we will not push it. A well-fitted extension setup with containment cables on a light single door is fine as it stands. The conversation is worth having when a heavier replacement door has been hung on an old extension setup, when there is headroom for a shaft, or when the clutter of springs, pulleys and cables in the side space keeps causing trouble.

Torsion gives a steadier lift, better balance across a wide opening and far less hardware hanging where you park. It costs more up front and it needs the room above the door. We measure, lay out both options and let you decide.