FIG. 1 is a perspective view of the base for a joystick controller showing our new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a top plan view thereof.

The bottom of the base forms no part of the claimed design. The broken line showing of various features such as the input buttons and cable holes, and the handle as shown in FIG. 1 is for illustrative purposes only and forms no part of the claimed design.