We claim the ornamental design for a portion of a reinforcing strut for an overhead door, as shown and described.
FIG. 1 is a perspective view of a portion of a reinforcing strut for an overhead door design broken to show indeterminate length and shown on an overhead door in broken lines for environment according to this invention;
FIG. 2 is a perspective view of the portion of a reinforcing strut for an overhead door of FIG. 1;
FIG. 3 is a right side view of the portion of a reinforcing strut for an overhead door of FIG. 2 with the left side view being a mirror image thereof;
FIG. 4 is a top view of the portion of a reinforcing strut for an overhead door of FIG. 2;
FIG. 5 is a bottom view of the portion of a reinforcing strut for an overhead door of FIG. 2; and,
FIG. 6 is a front view of the portion of a reinforcing strut for an overhead door of FIG. 2 with the back view being a mirror image thereof.
The views of the overhead door form no part of the claimed design. The broken lines represent environmental elements only and form no part of the claimed design. The height-to-width ratios of the overhead door may vary from the ratios of the specific embodiments shown in the Figures without departing from the claimed design.