like this ? it seem that you need to play on early version, the top one is the early version 1.0.0 and the bottom one is 1.0.4, please let me know that i'm not the only one who got this weird bug
It was meant to be like this, you are meant to fill all 4 slots on 55 to get it working, the previous ones where you can get it working without filling all 4 slots are actually the bugged ones.
v1.0.4 + Fixed an issue that allowed the elevator fuses to work without filling all the slots.