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the back truck has developed this annoyingly loud clicking sound which I believe to be the kingpin either being loose or not seated correctly or something.
The clicking, in my experience, is the washer rocking on the kingpin. The washer seams to be skipping across the threads on the kingpin. I think this can be fixed with a round file to ease the inside edges of the washer hole. I tested this theory, sort of, by waxing the king pin and washer when I reassembled mine, and it went away. It did come back in the next session, but I didn’t notice it after warming up.
As said, yes it is usually the metal washers moving against the kingpin, more often than not being the point between the bottom washer and baseplate, or the top washer and kingpin nut.
Things I have seen done with what seemed like permanent success include putting tape round the kingpin up to the point just under where the nut goes on and putting something on the washers / between washers and baseplate / kingpin nut, either tape or even something else, but the tape around the kingpin stops all that movement better than anything else.
After changing over bushings and metal washers it can sometimes come or go a lot more, which is curious, but can also happen on brand new trucks too, often depending on how much the nut is tightened down, as it is the force of turning that puts pressure on the bushings and nut to the point it moves ever so slightly, causing the click sound from side to side.