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The paper presents a proposal to introduce additional mass elements in order to change the resonance frequencies of the bell. This innovative approach is intended to eliminate the need to fine tuning this type of instruments in a traditional method, i.e. by mechanical working, but only by adding appropriately selected elements of specific weight, quantity and location. Another advantage of this method is that it is not interfere with the external appearance of the bell, because the components are assembled inside the object. The parameters of added elements can be selected using heuristic algorithms that allow for precise removal and shifting of sound components. Preliminary results of numerical and experimental studies indicate that the presented approach should find practical application. It can be developed by replacing mass elements with mechanical resonators or elements made of metamaterials.