The term "hidden mechanism" is a correct and usable phrase in written English.
You can use it whenever you are trying to refer to something that is not visible or easily detected. For example, "The hidden mechanism of this machine was finally uncovered."
They paused and, by a hidden mechanism, the tiers of their skirts began to spin.
This conjecture has presented physicists with an impasse: How could we ever know that some hidden mechanism wasn't at work?
Periodically, a geyser of water shoots up, triggered by a hidden mechanism connected to the Internet so that it coincides with actual eruptions of the real Old Faithful.
You lean against a wall, your shoulder innocently trips a hidden mechanism and you find yourself whirled into a hidden chamber.
In the final episode of "The Mary Tyler Moore Show," Mary Richards explained the hidden mechanism of our workplace sitcoms, telling her co-workers, "I thought about something last night.
"It made me deeply curious about the hidden mechanism that delivers success, and made me want to deconstruct the psychology of it – how changes in the central nervous system enable you to time the ball well or to perceive the movement of an opponent.
Some games add hidden mechanisms and secret tools to the world that react to those playing the game.
There will also be an exhibition of 16 clocks from a group of Cartier clocks known as the mystery clocks, which feature hidden mechanisms and intricate designs.
As your eyes become alive to both the work's mysteries and its self-evident simplicity, it is possible to sense a quiet renunciation of "Aten Reign," with its gorgeous effects and hidden mechanisms.
Recording from place cells and grid cells as animals perform complex behaviours has not only revealed hidden mechanisms, but has also shown just how beautiful our brains can be in the patterns they create and weave.
The hope is that seeing life in action at this scale will reveal hidden mechanisms behind cancer and other diseases.
