The assistive apparatus for hand held vessels or items is a device worn on the hand to facilitate the holding of anything of weight and to reduce the need for gripping strength. and is subsequently heated by heat exchange above a catalyst at a pressure of 10 to 45 bar to a temperature of 650 to 950\xb0 C. Methylcellulose swiftly dissolves when the water cools down. Products of the magnitudes of sine waves, applied to the input drive comb and shuttle magnitudes, are formed in the frequency domain and summed by coupling a plurality of resonators with a mechanical coupling frame, or by integrating them into one resonator.