there is a thread (no pun intended) on this subject in the forum.
http://www.bikeforums.net/showthread...dropout+screws
if the screws have been missing for sometime, I suggest getting the a tap to chase the threads.
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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