I'm not really one for speculating, so the picture below is inferring nothing (except that I drew on it with my foot!). The diagram of the spider assembly to the pitch change rod (shaft) in the report isn't entirely accurate. It doesn't show the metal spacer that is between the nut and the duplex bearing. My picture shows that- nut, washer, spacer, duplex bearing. Note the step, where the spacer couldn't move any further despite what torque was applied to the nut. Maybe this is purposely designed to prevent crushing of the inner race?
