"central instrument" is a correct and usable phrase in written English.
It can be used to refer to a key or essential tool or element in a particular situation or scenario. Example: The central instrument in our company's success has been our innovative marketing strategy.
Since Gazprom is the central instrument of that success, Putin keeps a careful watch on its interests.
The present value distribution of equity is used as a central instrument for evaluation of shareholder benefits.
The car's styling theme was oval: oval rear window, oval grille opening, oval central instrument panel incorporating the audio and climate controls.
The central instrument included three versions of passage with identical content but different schemata: descriptive (listing) pattern, explaining pattern and analysis pattern.
And whether arguing pro or con, most of the politicians and military experts have come back to it as the central instrument of U.S. power in this curious crisis.
The news reports that followed were neutral and factual, and it seemed that TV, a central instrument of Prime Minister Vladimir Putin's hold on power, was at last giving way under the strain.
Research infrastructures (RIs) are central instruments to implement this strategy.
As the Putin years took shape, Ernst and the channel he controlled became central instruments for building a new national culture.
Even though marine protected areas (MPAs) have become central instruments in the endeavour towards sustainable development, our knowledge on how different institutional designs influence outcomes is limited.
The logic TS4 has neither the extension property nor the co-cover property which previously were central instruments for construction decision algorithms for admissibility in modal logics (e.g. reflexive and transitive modal logic S4).
African music received one of its central instruments, the xylophone, from Indonesia, following a migration about 1,500 years ago.
