Try Sheldons pages. is there a very noticable difference where the thinkness changes? I bet you have wheel smith spokes.
http://wheelsmith.com/
http://sheldonbrown.com/
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk