Small metal object with clip on top. Clip spins around the object body and can be attracted to a magnet (so made of steel probably). Object body does not react to magnet (so made of brass maybe). Cone shaped tip seems to be made of some kind of plastic.

Found this in my back yard, probably from something I was working on, but it doesn't look familiar.

What is this thing? (Identification may help me fix something I don't know is broken!)