FWIW I haven't done this myself (don't have an OBS truck), but I recall others saying that you an retrofit an entire door latch assembly from an '80-'91 truck into the OBS door...this would give you metal rods forming a linkage between the handle and the door latch, so you don't have to deal with that cable anymore. Probably a LOT cheaper than a new cable from Ford, since you can pick it up at a junkyard...