Isn't there something resembling a freeze plug in the spindle, top and bottom, that must be removed for access to the actual king pin? Also, have you removed the lock bolt (part # 13 in the diagram)? If so, any movement of the king pin can be monitored by watching the notch for the lock bolt move in relation to the hole.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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