I was trying to install a new 19 mm bolt on my Titan for the tow hitch that I just got, I had to take out an already existing bolt that was holding up one of the exhaust hanger in order to mount the hitch where hanger was. Not paying much attention to the bolt coming out i threaded in the new bolt and noticed something not feeling quite right, felt like it was stripping. I took the bolt out and noticed it was pretty ate up, i looked at the original bolt I took out and its coarse threaded while the new bolt is fine threaded. What should I do now? I cant thread in the new bolt and the old bolt wont even go back up in there anymore either since i buggered the hole up, I could tap the hole out but do I go a bigger size, can I tap the hole out from coarse threads to fine threads or only the other way around?