The ornamental design for a combined massagestick and base, as shown and described.
FIG. 1 is a front, right and top perspective view of a combined massage stick and base, showing my design.
FIG. 2 is a rear, left and bottom perspective view thereof.
FIG. 3 is a front elevation view thereof.
FIG. 4 is a rear elevation view thereof.
FIG. 5 is a left side elevation view thereof.
FIG. 6 is a right side elevation view thereof.
FIG. 7 is a top plan view thereof.
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is another front, right and top perspective view of the combined massage stick and base, wherein the massage stick and the base are separated from each other.