So everyone knows that a worm gear will not hold a load but no one seems to know why.
Oh we do know why mate think about it. If you disconnected the worm gear from the brake drum, with the car still attached via the ropes, unless the car/cwt are balanced perfectly in the shaft the car will roll up because the cwt is generally 40 to 50% heavier by design. if the ropes were removed from the traction sheave then there is no load and therefore the no movement on the sheave/crownwheel/worm gear.
Hope this clears it up for you.
THIS is how we know your theory doesn't work.