Veronese Riddle

[-JKP-]

I guess there's a tradition of these riddles. I came across another one...

De summo planus, sed non ego planus in imo,
Versor utrimque manu: diverso munere fungor.
Altera pars revocat, quidquid pars altera fecit. 


I'll let you try to figure it out and hide the answer under a spoiler...

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My translation (note that my knowledge of Latin is very rudimentary):

The top flat, but not flat on the bottom,
Either way I am turned: different jobs I execute.
The other part revokes what the other has created.

When I first read it, I immediately thought of a pencil... because a pencil  has a sharp end and a flat end (the eraser) and the eraser can remove what the pencil had written, but they didn't have pencils way back them (or even in the Middle Ages). So I was scratching my head because it didn't fit the description of a quill.

It turns out it's a reference to a stylus, rather than a quill, the kind used for writing on wax tablets. Some of them had a knob on the end to smooth out the wax if a mistake were made.