I thought about my previous response that was less than complete. If you put new cable housing on the bike from one of those "bike tune up" kits like they sell at places like Wally World, that is not good housing. Get some at the LBS. You will be surprised at the difference.
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1971 Paramount P-13 Chrome
1973 Paramount P-15 Opaque Blue
1974 Raleigh Professional Blue Mink
1991 Waterford Paramount
Holland Titanium Dura Ace Group
Holland Titanium Ultegra Triple Group