The ornamental design for an amusementdevicesupportbase, as shown and described.
FIG. 1 is a front elevational view of an amusement device support base in accordance with my new design, a rear elevational view being a mirror image thereof;
FIG. 2 is a left side elevational view, the right side being a mirror image thereof; and,
FIG. 3 is a top plan view thereof.
The broken lines in the figures are for illustrative purposes only and form no part of the claimed design.
The bottom plan view of the first embodiment of the support base is not shown in the drawings or described in the specification and, therefore, form no part of the claimed design.