I did buy another FD last night, one that the seller said was brifter compatible. It was cheap, definitely worth a try or to keep as a spare if it is the same as mine.
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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