A breaker bar should do the job, but if you haven't got a torque wrench yet, I suggest you get one instead of a breaker bar. It will pretty much act in the same way (it's a solid metal piece so it is very unlikely that you will ever break it, plus it's longer than most 1/2 rachet so gives you more leverage) but it has a gauge that shows how much torque you are applying to the bolt that you are trying to tighten or loosen. You can get an inexpensive beam one for around 20 dollar. hope this helps.