With the extractor in place its impossible for the screw to miss the recess on the shaft (I think). Plus the extractor would just pull right out if I missed the recess in the shaft, its works fine when the screw is a bit loose. Also. the screw head is almost completely down into the recess in the lug. Its that last half turn that locks it. Maybe I better put a drop of lock tight in there and go back to worrying about the weather and the price of scotch.
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