Torsion Spring Replacement: questions about the price

Cold makes steel slightly less forgiving and thickens the grease on the coils, so a spring that has already used most of its cycle life is more likely to let go on a frosty morning when the door is first opened. The cold is the final straw rather than the cause; the underlying reason is fatigue from years of cycles, sometimes helped along by rust and dry coils.

Drum type and lift configuration

Standard-lift drums are the common case. High-lift, vertical-lift or low-headroom arrangements use different drums, cable lengths and turn counts, which changes the parts and the time involved.

Centre and end bearings

With the shaft out, bearings that grind, wobble or have seized are renewed. Smooth bearings reduce the load on the spring and opener, and their condition is confirmed by hand during the check.

Condition of the lift cables

Cables that show fraying, rust or a kink at the bottom brackets are replaced so the new spring pulls on sound steel. Two good cables mean this item stays off the list.