This MECCANO model date from 1924 and it seems not to have had detailed instructions ... So it is on the only drawing of catalog No. 4-6 USA that I built this model. I exchanged train wheels by tire pulleys with a worm drive. The carriage is moved by two tensioning cords and hoisting pulleys are assembled in 4-3 coaxial. This system stabilizes hook block but requires a significant empty load. Movements of this crane are quite realistic.