Special top link-pin and low-profile castellated nut. For some time the kit containing this pin and the bushes had a totally unsuitable Nyloc nut where the end of the bolt barely reached the nylon insert, let alone had three threads clear. I wouldn't use a Nyloc here anyway, it's holding your front wheel up! The Leacy repair kit:
Hub supported. Either behind the bump/rebound bracket, or the anti rollbar drop-link if replacing the bracket at the same time (note the missing bump rubber!).
Nut and bolt squeezing the bushes into the trunnion, daub with Waxoyl (note the king-pin is inboard of the trunnion) ...
... but still needed a paint scraper used as a guide to wedge the bushes between the arms (old damper as photo taken on a previous king-pin job) ...
... which were also wedged apart, clamp-bolt slackened right off.
