T440s - Key fell out, can't simply 'push' back on. Do I need to buy a new key?

[tpuser150]

Here is the back of the key: http://i.imgur.com/SFqnc34.jpg
Here is the hinge: http://i.imgur.com/Kb1CzQW.jpg http://i.imgur.com/m2a3Yof.jpg
The key was loose for a while and would fall out. Pushing it back in fixed it until yesterday. Is this key salvageable or do I need to buy a new one?

[axur-delmeria]

The pics are a bit blurry up close, but it may be that one of the tabs under the keycap has broken off.
It's the one on the lower right in the first image.

[RealBlackStuff]

There's also a lot of dirt when you look at the 2nd picture.
You can buy a complete new (L) key e.g. here: http://www.ebay.com/itm/311166412454
Yours looks like (eBay) TYPE C, Regular key, but don't hold me to it and ask first if L is available.