Measure the width of the space between the previous course of bamboo flooring and the wall, using a measuring tape. Subtract a quarter-inch from this measurement to determine the necessary width of the final course.
Mark the necessary width at both ends of the bamboo flooring plank. Place the plank on a work table, with the marks even with the table edge.
Place a metal straightedge on the bamboo plank and align it with the width marks. Clamp the straightedge and the bamboo plank to the table with C-clamps at each end.
Set the router bit to the depth of the bamboo plank. Turn on the router and run the bit along the length of the bamboo, using the metal straightedge as a guide.
Sand the cut edge of the bamboo plank lightly with a palm sander to smooth it.