Installation is super simple. Just remove original half-ring retention and install Armanov Quick Disconnect for Dillon. It has two internal springs and allows quick change of powder bar from one toolhead to another. Armanov Quick Disconnect fits on the RL550, XL650, XL-750, and Super-1050 powder measures. It is specially useful In combination with Clickable Armanov powder knob. So you can reuse powder measure on other tool-heads and adjust powder quantity with simple clicks. Quick and tool-less removal and installation of Dillon Powder Measures.