052. One String Pulley
For this building set, the mechanical toys look the most convincing to me. The construction of this one string pulley was simple -- once I got started.
The illustration shows two grooved discs for the drive belt. But the set includes no such pieces. So I built up the represented piece using a fiberboard collar sandwiched between two wooden discs.
As a static display, it was satisfactory. Had I wanted to have something that actually turned the second axle, I probably would have used a rubber band for the belt, and a single wooden collar on each dowel to prevent it from slipping off.