Abstract: A method of assembling an electrolytic capacitor comprise the following steps: an annular sleeve shaped cathode is inserted into the open end of a can; an anode structure is inserted into said can in a spaced apart relationship from said cathode, the space between said anode and cathode being filled with an electrolyte, said anode structure having an aperture or recess for reception of an anode lead; a primary seal, for sealing the open end of the can, and comprising an anode lead electrically isolated from the rest of the seal; is formed; a secondary seal is positioned on the anode lead on the inside face of said primary seal to form a seal between said anode lead and said can prior to sealing of the primary seal of said capacitor; the end of the anode lead projecting from said secondary seal is machined to provide projections on said lead; the capacitor is assembled by forcing the projecting portion of said anode lead into said anode until the primary seal is in position; the primary seal is welded around i