This guide will help you adjust the scrollability of the mouse's scroll wheel by replacing the spring.
Use a blue spudger to pry off all 4 mouse feet from under of mouse.
Use a Phillips #00 screwdriver to unscrew all 6 screws (3x5mm ) from under the mouse feet.
Lift the top of the mouse from the base of the mouse (separate the mouse in half) to expose the internal hardware.
Use the black spudger to move the tip of the metal spring off of the wheel.