Dummies identical in size and weight to the phantoms Helga and Zohar, which will fly to the Moon and back, were used to rehearse their installation in the Orion spacecraft. As part of this ‘fit check’, which is carried out for all experiments flying as part of NASA's Artemis I mission, it was possible for the first time to verify and test how Helga and Zohar will later be installed in the Orion spacecraft by NASA colleagues at the Kennedy Space Center (KSC) in Florida. This test was successfully completed in October 2019 in Building 9 at NASA's Johnson Space Center in Houston, USA.