Help! Parking Brake Installation

[rpatowers]

I am remodeling the interior of my 72 Chevy short bed step side 4 x 4. I removed the parking break to install a new firewall cover. I have the brake back in now but I am having trouble re-installing the cable to it. It is very hard to pull the cable back to install the pin. What is the best way to do this? Can the cable be "unhooked" to make it lose so that it can be stretched back and the pin installed?

Thanks!