Dave Ware writes: Plans from the Master Powerline Set of 1973/74 were simplified so that it could be built with a Senior Powerline Set.
Instead of driving the Drum Hoist via ladder chain from the Powermatic motor, they were mounted side to side and direct coupled. Also the DC3 motor driving the flywheel via another ladder chain was eliminated and the flywheel was driven from a shaft on the Powermatic motor with a rubber band belt. The resulting drive arrangement was much simpler.
A battery pack for the DC3 motor was originally used as the counter weight. Since this was no longer needed, an old speaker magnet was used instead.