The T2 protects loaded moon clips from damage. In addition, it controls the cartrides for a reliable insertion. An implement like this is usually called a "speedloader", but in our case moon clips already have the speed. We don't want to make any claims until Chris Baker measures it.
In any case, please see a 14-second video on X for a demonstration, and another video for loading hints.
T2: $16, shipping by USPS: $5