Spec addendum: pushes that count (one rule for the catch and for wheels that turn either way), drawing a block two packs know, and every sweep run again (#14, #15)
Spec addendum: what the second review found and what was done: loose blocks pay for water, fluid runs through a pulley hook, tied ropes, and part-wound rope that goes with its load (#21)
A water wheel with water falling straight through keeps turning one way when the motor on its shaft is fed by a generator on a second shaft: any motor with a generator's current in it only slows a turning wheel (#18)