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@bq
remove some of the insulation and twist old and new wires together lots - over an inch or two, but not so it gets too fat. use electrical tape to cover the join and hold the insulation as well, then carefully feed the new wire in while pulling the old wire out. Eventually, unless you're too forceful and break the join, the new wire will be happily sitting in place.
If there are removable rubber grommets, remove and slide them up the wire so there's more wiggle room and less friction. replace once the new wire is in place.