The ornamental design for an adjustable spoonbase, as shown and described.
FIG. 1 is a perspective view of the adjustable spoon base of the present
invention;
FIGS. 2 through 6 are, respectively, a top plan view; a side elevation
view; a bottom plan view; a left elevation view; and a right elevation
view of the device shown in FIG. 1; and,
FIGS. 7 through 11 are, respectively, a top plan view; a side elevation
view; a bottom plan view; a left end view; and a right end view of another
embodiment of the invention.
The broken lines are for illustrative purposes only and form no part of the
claimed design.