Hello Terry,
I use the Crankandstein, because it was the lowest cost at the time I bought it. It is mounted on a piece of 3/4" plywood with a SS hopper and 170 RPM gear motor.
Maybe I can give you a link: www.hobbybrauer.de/bilder/Biermann/K6...
I believe it works well, the gap is 0.6 - 0.8 mm, depending on the raw material. The malt is conditioned before I roll it, becasue it is to dry and 'explodes' to much when rolled 'bag dry'.
The moiture is increased by 4% a day in advandce.
All the best, Joerg