On the tip from the four-by-four inch piece, attach with a "U" bolt a pulley significant more than enough to deal with one/2-inch rope. A pressure grapple (closes when pulled, opens when launched) can get a whole sheet of plywood and raise it to the 2nd floor quite successfully. Again, https://israeltuutt.anchor-blog.com/14809558/one-way-web-lifting-sling-strap-things-to-know-before-you-buy