On the top with the 4-by-four inch piece, connect that has a "U" bolt a pulley large sufficient to deal with 1/2-inch rope. A rigidity grapple (closes when pulled, opens when launched) can seize an entire sheet of plywood and raise it to the next floor quite successfully. Yet again, https://sethaeqry.blogsumer.com/33676758/the-basic-principles-of-polyester-webbing-cargo-net