I bought a 10"/20" Powermatic drum sander from Woodcraft last year. It
seems to have an alignment problem: when I sand a board that's about 8"
wide, it comes out slighly thicker on one edge than the other - about
.010" thicker on the inboard side (the side closest to the motor). How
do I adjust this thing so that the spacing between the drum and the bed
underneath is uniform all the way across?