Mine were the same. I assumed they are to stop them coming loose. They were very tight and needed to be held with the vice.
David
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Click to see my build photos on Flikr
http://www.flickr.com/photos/67112582@N03/
Saturn MX5 Based Chassis, Limited Slip Diff & 2.4 Quick Rack.
Build cost.... seems to be spending more on tools than car bits at the moment! (they will be handy in the future though).
Car iva'd and passed 15/08/2014. Finished weight 572kg.
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