disk brake nut

on a scootrs/nissin/generic type hydraulic conversion, should there be a half nut on the n/s spindle between hub and link (similar to innocenti disk)?
im looking at a friends scoot and must admit i havnt seen many of these before, there was no half-nut, but it seems to me there should be..
thanks
im looking at a friends scoot and must admit i havnt seen many of these before, there was no half-nut, but it seems to me there should be..
thanks