"Plank in the flank" or Schaffer method of correction of torsion of the uterus by rolling the cow around the fetus which is kept in place by applying pressure to her abdomen by a person standing on a plank. Note the head of the fetus in the diagrams, it does not change position. The cow is rolled around the fetus to correct the torsion.
After the torsion of the uterus has been confirmed, one end of the OB chain is placed on one foot, and the other end of the OB chain on the opposite foot. A small loop of the center of the chain is left hanging out of the vulva.
The cross bar is turned in the proper direction to correct the torsion. The area of the chain between the feet of the calf and the proximal end of the speculum should be checked for entrapment of uterine tissue.