I had to make some small spacers. They are square 4140 annealed, LxWxH is 25 mm x 13 mm x 13 mm. I was using light roughing passes with .010" stock to leave with a 1/4" 4 flute carbide. Took a finish pass at final depth, all .010" at once nice and slow. repeated finish pass. The problem is i think tool deflection. The top of the square block measures 13.13 and the bottom measures 13.24 mm, the bottom is consistently .1 mm wider. To me, this is tool deflection, but how do i eliminate this? Is 1/4" tool really too flimsy at a .75" stickout?