I think you missed the point Terrell... He needs to bend a new gear to accept the wheel.

Assuming that you do not have a bender, Clamp the gear in a vise with the amount you want folded over sticking out the top. Now put a piece of wood against it and get out your trusty hammer.

Don't heat it! That metal is tempered, heating it will make it soft, and you'll never get it back to it's original properties.