I’ve heard written that a car has about 30,000 parts including bolts and screws. Probably not something you want to take apart and put back together some weekend. I’m pretty sure I would have some parts left over, maybe 10,000. Not a problem, though. I could store them in jars in my garage.
There are mechanical wonders who can take apart cars, repair them and put them back together without leftovers.
And there are parts meisters, like Serge at the local parts store, who keeps track of thousands of variations of those 30,000 parts and serves ’em right up.