^ I second that. The cause was likely a crash of some sort or perhaps just a rare overly brittle dropout. does the paint around the broken dropout match the rest of the bike?
If you like you can email me some pics and I'll post them.
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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