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Remove the stock base from the router, then use a marker to trace around the base onto a 1/4" thick piece of clear acrylic. Trace the screw holes, but leave the protective coating on the acrylic (for now) to prevent the marker from smudging.
Use a drill press to drill holes through the marks made for screw holes. (Drilling through acrylic can be tricky; drill slowly to prevent the material from cracking.)
Use a countersink (chucked into a drill) to widen the top of each of the screw holes. Use the head of the actual screw that will be used in the hole to make sure the head countersinks into the hole.
Make a hole in the center of the base using a drill press equipped with a hole saw. To find the center, place the router on top of the acrylic, align it with the marks drawn on it and plunge down hard. This will make a mark on the protective coating to use as a center point for drilling the center hole.