👨🏻‍🔬🔄👩🏻‍💼device to switch bodies

Your great-grandfather was the chief scientist for secret experiments on changing the bodies of two people in the USSR in 1969. Everything worked, but the experiment was stopped, and all the participants and scientists were eliminated, but your grandfather managed to hide and start a new life in Omsk, and now your grandfather, who is already 96 years old, gave you the drawings of the device and instructions for use.