The present disclosure relates to an elongated member for a hydrofoil, to a hydrofoil with such an elongated member and to a board equipped with such a hydrofoil. The guiding mechanism of the roof rotates around the principal shaft for actuating the roof to displace between a closed position and a retracted position. A relatively short time listening to a prompt before hang-up, indicates dissatisfaction with that prompt. This is done to improve the critical dimension uniformity across the substrate. The method includes removing at least a portion of the bridge resulting in a segmented electrode assembly having at least one segment. The mechanism may be operated by rotating a cam and semicircular disc to position an opening on a simultaneously rotated wheel over the desired passageway.