A method and means of hot dip galvanizing completely assembled and machined trailer wheel suspension systems as a unit, without affecting machined wheel spindle surfaces, is described. Spindle protective sleeve caps having an interior nut operative to be screw-threaded on the wheel retainer nut threading at the outer end of a wheel spindle enables force-fitting the inner end of the sleeve cap in sealing relation against the suspension arm hub which carries the spindle, so as to completely cover and seal the spindle during unitary hot dip galvanizing of the suspension system.
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