The ornamental design for a gripportion of a paddle board paddle, as shown and described.
FIG. 1 is a top plan view of a grip portion of a paddle board paddle showing my new design;
FIG. 2 is a top plan view thereof, drawn to an enlarged scale;
FIG. 3 is a left side elevational view of FIG. 2, the right side being a mirror image thereof;
FIG. 4 is a bottom plan view of FIG. 2;
FIG. 5 is a cross-sectional view taken in the direction of arrows 5-5 in FIG. 3; and,
FIG. 6 is a cross-sectional view taken in the direction of arrows 6-6 in FIG. 3.
The broken lines in FIGS. 1 through 4 are shown for the purpose of illustrating portions of the grip portion of a paddle board paddle that form no part of the claimed design.