[cadillac512]

You do just like you said. Make sure the brake handle is fully released. Pull the cotter and the pin, loosen locknut, turn the yoke a few turns, pull cables forward to reinsert pin in yoke. If you adjusted too far the pin won't fit and you'll have to back off a bit. Tighten locknut,install cotter and done. Pulling cables forward (thus actuating the brake) to install the pin is the trick. If the brakes don't drag with the handle released all is well.