Homemade shafts / spears to penetrate the fornix in the cow to gain direct manual access to the abdominal cavity. The Kimberling-Rupp ovariectomy instrument, at the bottom, serves as a model with a length of 45 cm and a diameter of 2 cm. At the top is a stainless steel pipe with a beveled tip to resemble a giant needle. These can be made from a recycled IV stand or the leg of a small surgery table. Below it, is a piece of PVC pipe of the same dimensions. Next is a plexiglass rod again of the same dimensions. The PVC pipe and the plexiglass rod become bent / deformed upon autoclaving.
Drost M (1982)