I received a tool without the locking mechanism (left side of a sortimo L-boxx G4) so I tried to rebuild it myself.

I'm not an expert at this but it works great for me !

Be careful when clipping the locker on the L-boxx the pins are quite fragile. The stl is right side, just mirror it in cura to get the left side if needed.

UPDATE: Minors improvements - more flexible pin + reduced length of pin to clip it more easily