Bersa Thunder Help?

The Bersa Thunder .380 has become a weak low pressure front. Why? The disconnect/drawbar spring broke. Get a new one all day long for a buck fifty. That is not the problem. The spring is staked into the pistol. The broken remains look like this:

You can see where it was staked into the pistol.
So how to I remove the remnants of the old one and get the new one to keep from wandering around? 

New one looks like this. 

 





See that hook on the right side? That goes into the lower preventing me from trying to simply pull whats left out. 

Help?