I just bought a 1997 Trek T100. It has been upgraded to drop bars and bar end shifters. The stem has too much rise to suit me. It has a threaded fork. The stem is 28.6 (1 1/8")OD. I have a threadless stem with the right amount of rise for a 1 1/8" fork. Where can I find a column adaptor that would be a straight 1 1/8"?