HENDERSON CASTRATION METHOD
1. Attach the Henderson Castrating Tool securely in a standard, variable speed electric drill, preferably a cordless type, for safety and convenience. It is essential that only a variable speed drill with a 3/8" chuck is used and that the castrating instrument be tight and secure in the drill chuck. Important: Tighten the instrument with a drill chuck tool--hand tightening is not adequate.
2. Open the scrotum, or sac, with a Newberry knife. With one hand move the testicles high in the sac and slit the sac side-to-side at least halfway up. Testicles will then drop down.
3. With the testicles thus exposed, grasp a testicle in one hand while using the other hand to push the sac upward, exposing 3 to 4 inches of cord.
4. With one hand holding the tool and drill and the other hand holding the testicle, clamp the plier of the Henderson Tool across the entire cord, just above the large portion of the testicle. Place the "flat" side of the testicle toward the tool so the testicle will not "flop" excessively while the tool is twisting the cord.
5. With slight tension on the drill and with the tool and drill in a straight line with the cord, hold the cord loosely between the fingers just above the clamp of the tool to keep the cord centered while twisting.
6. Begin rotation very slowly, then let the speed increase slowly with slight tension on the cord. The testicle will be removed after approximately 20 turns of the tool.
7. The cord will be severed by the twisting action. The twisted end of the remaining cord will substantially reduce bleeding through the severed cord.
8. Use the same procedure for removing both testicles. It is recommended that a screw worm spray or similar insecticide product be used after castration to help eliminate fly strike, especially in hot summer months when flies are at their peak. It is advisable to administer a tetanus shot in areas where endemic tetanus may be a problem.