If you go to this link:
http://www.tektro.com/_english/01_pr...s&sort=2&fid=3 and download the user's manual in the lower right side, you should see a diagram of how to assemble it. Hopefully, that will give you a clue as to how to fix it if yours is similar.
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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"