i was able to remove the spring at the compensator(swing-tree, horseshoe) after disconnecting from the cables at the drum.
you may be fortunate the cable is already out of it's crimp, because uncrimping in the tunnel is painful.
perhaps the cable slot has that hole in it?
i ended up removing everything, and hung the rear cables, started running wd40 down the cables and was able to eventually free it up nicely. i have heard this may be just a temporary fix and note that any binding may overwhelm the springs on the brake shoes, but intend to see how long it will work(they really move "slick"- like new). reinstall was much easier after developing the disassemby techniques, so i won't mind doing that part again when i have too.
i used this wd40 treatment for the heater control cable and the clutch cable also.