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Constants/Hacking: we use them mostly to determine the quotient between two constants.
The redefinition and better identification of constants never comes to a conclusion. This is not a "continuation of the theory by other means".
Constant/Constant of Nature/Hacking: the value of a constant is not part of the theory. - Most of them are connected with other constants by physical laws. - The gravitational constant is connected with nothing else. - ((s) Because the Earth is inconsequential for the cosmos.)
Duhem: qualitative fact: that the universe can be represented by certain mathematical models - further qualitative fact: that there is a number that goes best with our mathematics.
Hacking: we use constants usually to determine the quotient between two constants. - We reach no end to the improvements.
Einführung in die Philosophie der Naturwissenschaften Stuttgart 1996