Hey guys, I found the source of an oil leak on a 22RE I'm working on -- it's the upper right bolt where the EGR mounts to the head. I removed it and was surprised to find it is not a bolt, but rather a nut on a stud (with oil clearly leaking out the threads). My question is, should there be a bolt here instead of a stud? I need to remove the stud either way in order to put some sealant on the threads.