RATS!! I just sold a bike with those and never thought to do a step by step pic thing, while taking the flat bars off and putting drops back on.
if the RD does not habe an adjusting barrel I would find a newer one like masi61 suggest.
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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