parking brake cable, conduit fingers

[dmjlambert]

In the rear drum brakes where the parking brake cable enters the brake shoe and lever area, I am showing a close up picture of the fingers the conduit grips the entry hole with. I would like to remove a good cable from one truck and install it in another truck that has a bad cable assembly. I am reading the Haynes manual what it says about these, and I can't find mention of them in the Chevy service manual or Chilton's manual. Haynes says to compress the conduit fingers and withdraw the cable assembly. It sure sounds easy and I did this job once before about 5 or 6 years ago and I don't remember having difficulty then. Is there a trick to compressing the conduit fingers, preferably all at one time, and then the cable assembly will come out?