Fluid-borne noise suppression

A method of securing a restrictor (42), having an open hollow cylindrical end shell (44 or 46), to a spirally wound tuning cable (34 or 34a) having an end disposed in the shell, wherein the shell is magnetically deformed radially inwardly to grip and conform to the outer surface of the tuning cable end. The restrictor may be of steel, brass or, most preferably, aluminum construction.