If you mark up where the eccentric nut sits,and refit in the same place you will not be too far away.I think it can be wound right round and round which moves it forward and backward on the bolt,this will change the castor angle,so again you need to check distances from either side of the inner edge of the upper wishbone.The wishbones have a sort of rough thread in them ,so they need to be aligned well when you replace the bolt.Hope this helps.
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