X2. Not so effective on newer cars, but does sometimes work. I remember my grandpa getting into a 72 caddy and going nuts on the starter with a hammer. Freaked me out, thought he went crazy LOL. You kinda had to be there, but those were the cars that you could literally get inside the engine area and sit next to the engine, huge cars.you can sometimes beat on the starter solenoid with a hammer...just give it a few good love taps...and that will sometimes make it work for a while.....