Abstract: The discussion relates to loading electronic assemblies on multi-shelf chasses. One example can include a vertical positioning mechanism configured to be secured to a multi-shelf chassis and to align a carrier supporting an electronic assembly with an individual shelf of the multi-shelf chassis. The example can also include a horizontal positioning mechanism configured to extend the carrier along the individual shelf and an anti-deflection mechanism configured to reduce downward deflection of the carrier when the carrier is extended into the electronic assembly loader tool along the individual shelf.