Well, the low speed would be nice, but more torque is what I'm after. I planned on using my dad's old 3/8 drill that's been around forever (rebuilt twice), but it's smoking after a few minutes. The largest problem may be the diameter of the crusher rollers. I built this crusher myself and had no idea how much force would be necessary to crush the grains.
Thanks for the offer, Figbash, but if I had my 1/2" drill running, I probably wouldn't need it. I have to rebuild the part that holds the brushed in place and never got around to doing it.
I'll look for that right angle drive reducer. I could use one of those around the house anyway. I have several motors on hand, but none are slow enough to consider using without much hassle, and I already have enough projects on my plate. For the brewing that I will be doing, it wouldn't be hard to hand-crank my grain. Or have my daughter do it...