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Recently, a simple heuristic modification of the Newton potential with anon-zero delay-time $\tau_G$ has been proposed. Our modification is largelysuppressed for purely gravitational interactions, it becomes relevant undernon-gravitational accelerations of the sources. We illustrate how the choice$\tau_G\sim1$ms may already influence the 5th digit of G determined byCavendish experiments. Re-evaluation of old Cavendish experiments andimplementing slightly modified new ones may confirm the proposal or, at least,put a stronger upper limit on $\tau_G$.

Equation and test of possible delay time of Newton force