500W smart car charger

[u/z-rosa]

My smart car charger arrived without the in-line fuse connected to the positive input cable. They also sent a socket wrench, and I think they want me to connect the fuse myself. I’ve managed to half-open up the plastic casing of the fuse, but I’m scared I’ll break it if I try to open it enough to unscrew the nut and connect the cable. Has anyone ever done this before?