That contraption on the right is an indexing head. On the front you notice there is a plate with holes in it. Did Joel give you any additional plates with holes in it? That indexing head will turn that chuck on top to just about any amount of stops you can think of. Used for making slots...
Good maintenance is always a good/great thing! And not having salted roads. I had a 2006 with the 4.6, wasn't a big fan of that weezer but other than that, it hung in there. I get a new Explorer about every 10 years. This is the start of the fourth decade. Fingers crossed.
:beer: