of the tubes into the corresponding lower tube slots and to define a plurality of air gaps between the flat sides of the tubes the method continues by inserting an air fin in each of the air gaps between tubes in first and second groups of tubes to engage the flat sides of adjacent tubes and extending between the headers the method proceeds by inserting a bend relief spacer having first and second legs and at least one cross member and engaging the first and second legs of the bend relief spacer with the flat sides of the adjacent end tubes of the first and second groups the tubes air fins and bend relief spacer are made into one integral heat exchanger by brazing the plurality of tubes to the upper and lower headers and brazing the air fins and bend relief spacers to the flat sides of the tubes the method is finished by bending the upper and lower headers to define at least one bend separating the first group of tubes from the second group of tubes and moving the legs of the bend relief spacer angularly with respect to each other about a pivot point defined by the cross member to maintain the legs in engagement with the flat sides of the end tubes of the first and second groups while the invention has been described with reference to an exemplary embodiments it will be understood by those skilled in the art that various changes.