Barry, I believe you are mistaken in your description of the wire wheel
adaptor nuts. I have a set of wires that came off of a 69 Spitfire that were
completely original, and they had never been off of the car. The nuts only
have one bevel on them, are twice as long, and have a smaller hex diameter
than the nuts for steel wheels. The reason for the longer nut is that the
adaptor nuts for wire wheels require greater torque than those for steel
wheels. The nuts have a smaller diameter hex so a socket can be used to
achieve the proper torque. I believe the hex size is 11/16".
John C. Smith
75 Spitfire
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