I was fingerboarding for a while then all of a sudden my hanger came off, so i put it on again and it kept hapening, now when i put the nut on i can lisghtly pull off the hanger
what can i do

u can change the kingpin cuz it sounds like the threading is worn out. or u can get some super glue and glue the nut onto the kingpin so it wont fall off.

glue the kingpin nut, easiest, simplest, and cheapest thing to do. Happened to me on a set of td baseplates once, but I got new baseplates. That'd also fix the issue.