Im replacing the sprockets on my bike, well trying to, and the front sprocket will not budge. Im using my impact gun but it still doesnt want to move. The lock washern is flat, the rear wheel is all locked up so it wont move, and the thing is soaked in WD40. I tried using a heat gun to loosen it up but to no avail. Any ideas on what might be going on? I need to find my breaker bar and try that, but if the impact isnt doing it im not sure what to do. Thanks in advance 

