Unscrew the handle, take an 18 inch piece of 1/2 inch clear tubing and hose clamp it to the nut holding the cable to the wall. Pour some oil in the tubing and let it sit over night.
Mark the tubing with a sharpie at the level of the oil when you fill it. The oil will wick up the cable housing. Works like a charm and you don't need to cut the coroplast.
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