What is the green piece?

[bornblue82]

So I removed the keys on my piano to clean underneath them. I had a difficult time removing the F sharp black key. I'm believing it was a dead key. How do I adjust this green peice to correct the problem. Just to add when I install the key, the hammer is pressed down on the string the entire time. Any help would be appreciated.

[bornblue82]

Found the problem, the action pin was miss aligned. Simple repair!