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It is so the bottom of the nut has a level surface to bear on. First tapered spacer allows angled shock to bear on a level surface (coil bucket) and second taper allows angled bolts to have their nut bear on the surface of the tapered spacer.Actually, I think it was. It's been apart so long I don't remember but why would there be a spacer on to of the bucket? Just to make the thread length equal?