Has anyone ever made their own pulley for winching out logs when the log cannot be winched in a straight line? My idea would be to have a pulley that could be attached to a nylon strap which could be wrapped around a tree. I Imagine the pulley system should have a simple nonremovable pin, (which would prevent loss of the pin), but could slide into position to keep the cable in place and slide to another positon for removal of the cable. Is a build yourself pulley worth the effort or are there pullies out there in consumer land that are to reasonable not to buy?