In article , "Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote:

The other thing -- you probably wouldn't need it, but to get full output
from it you'll need to apply roughly 80lbf to the handle. I'm not sure
"women and children" (as advertised) would actually be able to do that.

True enough -- but how often have you encountered lug nuts tightened to over
3600 ft-lbs? IME, even the most aggressive tire stores don't go beyond 200
(and I call them up and complain when I find that!). With a reduction ratio of
68:1, it requires only about 3 ft-lbs on the handle to produce 200 at the nut,
easily achieved by any child old enough to walk.

Leverage *is* impressive. I remember pulling old wooden fence posts with a
chain and a bumper jack -- and how much fun my then 4-year-old son had helping
me. I'd wrap the chain around the post and hook the jack into it, then have
him jack the post out of the ground. It was, quite literally, child's play.