I always take a hammer and hit the head of the bolt a couple of good sharp raps before loosening a bolt screwed into aluminum. Corrosion is your enemy and if you don't do that and they are corroded you may break one. Never trust that the person that put it together before you put anit-seize on the bolt before assembly. Don't forget to put some on the bolt when you put it back together. It's worth the price of the compound.