This reminds us that when the pullers started with the project, all wore yellow gloves and PULLED on the ropes. But many found that very hard work, getting rope burns and blisters on their hands -- and so after a while the organisers developed a sort of harness for each puller, with a bar in front of the chest and a connection behind onto the main haulage rope. So those who were drawing the stone along were facing forward and PUSHING -- and were able to use their body weight much more effectively. The men with the levers who walked along behind the stone were there to lever the loaded sledge back into position when it slid sideways -- as it did with alarming frequency.
In spite of these innovations, and the use of modern ropes and friction-reducing Netlon to increase sliding efficiency on asphalt roads, the stone pull was still an unmitigated disaster, proving without a doubt to all of those involved that the hypothetical human haulage of 80 bluestones from Presell to Stonehenge was just about as reliable as the "aliens from outer space" hypothesis.