Xcel brake pad adjustment

I was told by and official that I needed to adjust my son's pads on because they the kart rolled a little while my kid was holding the brake. Then he had my son hold the brake and push it with his foot. Blah blah.

Anyway I'm told you just turn the Allen key with the spring, they won't budget, they'll only loosen. So I figured they're turned in as far as they go. Well as you can see in the picture, they've worn a bit uneven, but don't appear to be worn out.

What am I doing wrong? How do I adjust my break pads tighter to the disc?
 

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