On my 87 300D I'm trying to replace a broken radio antenna coax cable. The connector in the trunk broke. Tried spliceing in a salvaged end connector but the center wire in the coax cable is so delicate the fix only lasted a couple of weeks. I bought a NOS cable. Trying to remove the old cable is a real pain in the you know what. It got stuck in the center tunnel. Any suggestions on how to thread the new cable through the trunk to the radio?