I’m sure some of you know I’m chasing a rocker oiling issue now, which leads to a distributor question. Hopefully the pic works. Should there be an o ring on the distributor shaft? This groove I’m pointing to looks like a great place for one. If so, when I install one do I need to get a petroleum resistant material? I would assume so. Also, what it this thingy hanging off the side that I’m pointing to also?? Thanks! J