how do i remove this Crankshaft Sprocket(keyway damaged)

[Hixc]

picture below. my car wouldnt start, and this is why. now how do i get this sprocket off, i have the new woodroof key

Imageshack - img11631.jpg

 

[Scottydoggs]

you will need a 3 arm puller, like this, American Presto 3-arm Heavy-duty Gear Pullers - JCWhitney

the one for 30 bucks at pep boys will do the trick, its got more adjustment with 2 holes on the arms for different applications.