rotating lever造句

Connected to the midpoint of the rotating lever is a long metal arm.
It mechanically worked by depressing a rotating lever so that an inked letter made contact with paper.
At the entrance to the library of the Consumers Union testing center here sits an apparatus that resembles the innards of a piano, but with an angled plank, some rotating levers and strange knobs protruding all around.
It's difficult to find rotating lever in a sentence. 用rotating lever造句挺难的