Didn't Sheldon Brown have a post where he used a seatpost collar to compress the headset so he could have a long steerer tube without spacers? Don't remember where off the top of my head and am too lazy to google it, though.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"