Jed and I started plowing our field today with a old two bottom plow... the soil was loose so the horses could pull it if you cheated a little on the furrow so they were only plowing with one bottom. I drove and Jed operated it by pulling a strap which would engage a cog on the steel wheel that would lift it or drop down the plow bottoms.
We stopped when the back wheel feel off... my dad told me years ago that those old plows didn't like to be greased and he was right.