A maker had three choices when designing a mechanism for a dwarf Vienna Regulator. They could add an extra gear to the trains, they could use extremely fine teeth on the gears that make up the trains, or they can use very small winding drums. Marenzeller took elements of the last two. The teeth on all three winding drum gears are very fine, and the drums, measuring a centimeter (roughly 3/8 inch) in diameter, are amongst the smallest I have seen. Such very small drums result in very little leverage for driving the trains. Which translates to little power. When I finish setting up a train I always test its motion by driving the train with a fingernail in the teeth of each of the winding drum gears. I think it would amaze you how little effort it takes to make each of the trains spin. I know it amazed me, and I work on some really wonderful mechanisms!