The ornamental design for a tablebase, as shown and described.
FIG. 1 is a perspective view of a table base showing my design wherein the
side and end not shown are the same in appearance as the respective side
and end shown;
FIG. 2 is a top plan view of a table base showing a second embodiment of
the design wherein the table base is round in plan rather than elliptical;
FIG. 3 is a side elevational view of the FIG. 2 embodiment; and
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a perspective view of a table base showing a third embodiment of
my design wherein the side and end not shown are like the side and end
shown, respectively.