Which preposition to use with counterweight

against Occurrences 2%

After the unification of China, Korea had reason for seeking an alliance with the Turks, in order to secure a new counterweight against China.

to Occurrences 2%

Travel, leisure, freedom, comfort, property and increased ability for business competition are the rewards of abstinence from parentage, and even the disapproval of President Roosevelt and the pride of offspring are insufficient counterweights to these inducements.

of Occurrences 1%

Nicholas lurched his body over the brink, his arms outstretched, straining farther, farther yet, till it seemed as if only the counterweight of the rest of the population at the other end of the canvas prevented his joining the Boy in the hole.

Which preposition to use with  counterweight