Photo
Situation
Even for corrosion-resistant stainless steel wires with coatings, if not inspected for many years, the wires inside are cracked and exposed.
If used as it is, the wires become tangled and become like a knob, the wire may come off the pulley and the sash may stuck or fall.
Such indications
When moving the sash, there is a feeling that it stops for a while on one part and moves again in another
