M4 to M3 hex nut converter

This is an M4 nut to M3 nut converter. Basically a larger M4 nut with a cutout to put an M3 hex nut inside it. I'm using it since I needed a wider M3 nut the size of an M4 with with M3 threads.. Also has second model of the same thing but includes a “retention wall” to keep the M3 inside the M4 with gravity(or glue maybe? I don't know your life)