Share 'How do you make shims?'

I work on about 3 guitars per month so buying expensive tools is not something I do unless it will greatly improve my effectiveness. Lately I have noticed making shims is taking me way too long and they typically come out less than acurate. I have contemplated buying or making a "luthiers friend sanding station" or getting a safe T Planer. The shims I most often make are approx .025" for shiming…