Don't feel bad. The Velocity V2 clones had a tiny pin in the center of their 510. You could remove this tiny pin, a grub screw to make it a capillary screw (squonk pin). Goober I am had no clue so didn't remove it until after some exasperating trial and error.
WE have ALL done done oversights like this . Some bigger ones . Some not as big . If you do not make mistakes , you are not human . We just have to learn to be better . YAAAYY !!