Joined: Jan 2010
Posts: 9,831
Likes: 1,809
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
I should mention 1980's Cannondales with 10-32 threading, at least at the bottle cage riv-nuts, and late-1980's Raleigh Technium (the "backwards" one with 753 steel tubes and alloy lugs) which used 10-32 threading at the seatpost clamp.
These were simple to chase out to M5x.8 since the two sizes/pitches are so near to identical, but tapping the Riv-Nuts in the Cannondale requires some care to prevent the nut's spinning loose in the tube wall.
Well, tapping anything requires care to prevent breaking the hard/brittle tap!!!