Full Idea
First, a thing can be a part in a way that is relative to a time, for example, that a newly installed carburettor is now part of my car, whereas earlier it was not. (This will be called a 'temporary' part).
Gist of Idea
A 'temporary' part is a part at one time, but may not be at another, like a carburetor
Source
Kit Fine (Things and Their Parts [1999], Intro)
Book Reference
-: 'Midwest Studs in Philosophy' [-], p.61
A Reaction
[Cf Idea 13327 for the 'second' concept of part] I'm immediately uneasy. Being a part seems to be a univocal concept. He seems to be distinguishing parts which are necessary for identity from those which aren't. Fine likes to define by example.
Related Idea
Idea 13327 A 'timeless' part just is a part, not a part at some time; some atoms are timeless parts of a water molecule [Fine,K]