I use all of the above ideas starting with the easiest ones first and progressing to the more difficults ones. Try a little heat and penetrating oil first, also give it a couple good wacks with a hammer when its a little warm. Sometimes the bolt just needs to know who is boss.:elkgrin: Also sometimes if you heat them up good, cool them off with penetrating oil(do in well ventilated area with a fire suppression device at hand), and then they come right out. I usually do the welding trick as a last resort.