How to replace the retaining spring behind the rear emergency brake disc by hand on 2007 Suzuki Forenza

I was changing the rear brake pads, when I noticed a spring fell off behind the emergency brake disk. How should I compress the spring to get the nail in and locked by hand? I'm having a hard time holding the emergency brake piece down and trying to compress the spring enough to get the retainer clip over the nail to turn and lock it. Is there a special tool to do this?

Asked by for the 2007 Suzuki Forenza