The phrase "a primary instrument for" is correct and usable in written English.
It can be used to describe something that serves as a main tool or means to achieve a particular purpose or goal.
Example: "Education is a primary instrument for social change and development."
Alternatives: "a key tool for" or "a main means of".
The Hawken was used mainly by hunters and trappers who opened much of the West to eventual settlement, the Sharps was a primary instrument of annihilation for the buffalo, whose near-extinction had dire consequences for Plains Indian tribes who depended on it.
Education was seen as a primary instrument in recognizing and providing equality for those suffering disadvantage because of sex, race, ethnic origin, age, or physical disability.
In this case, access to health services and financial protection from catastrophic health expenditures is the public good, for which a primary instrument may be health insurance.
Israel, like the Sunni Arab gulf states, also fears that resolving the nuclear issue would remove the primary instrument for containing Iran as a regional power.
The primary instrument for recording of magnetic field variations is the fluxgate magnetometer model FGE, manufactured by the Danish Meteorological Institute in Copenhagen, Denmark.
So they've got two demands from the government, which is to get more capital and to stop using the primary instrument for getting capital, the result of which is they're going to go out of business.
Robert's primary instrument for composing was the bass, and Dean complimented his achievements: "It's probably easier to tell a story through a piano or a guitar, but when [someone] can tell a story with a bass, that's pretty remarkable".
The Premonitory Urge for Tics Scale (PUTS) has been the primary instrument for evaluating premonitory urges in children and adolescents.
