why don't you try adding a small amount of plumbers ptfe tape around the thread, it may help to stop the king pin coming loose.....or a small srew like associated use to stop the hinge pins falling out of the w/bones, you won't be able to tighten the screw but it will stop the king pin from falling out at least.
im using teamline hubs with the 3racing zx5 knuckles, when i cut the kingpin peg/boss down for it to fit into the 'c' hub i made sure it was a snug fit ( think it was .8mm i machined off ) so the shoulder of the king pin can lock up against the knuckle tight, as the shoulder of the kingpin is longer then the width of the bearing it will still turn free as it should. Never had a problem with this always tight when i check.
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