Replaced both rear struts over the past 2 days. The first side was much harder than the second. I couldn't get the bolt to budge out of knuckle, after pounding on it with a hammer and air hammer. Eventually I got it out, but the bolt started to bulge since I was banging on it for so long. I had to grind it back down to get it back into the knuckle. The second side was a piece of cake, no major issues. Thank god for air tools.