Curmudgeon in Training
Join Date: May 2009
Location: Rural Retreat, VA
Posts: 1,956
Bikes: 1974 Gazelle Champion Mondial, 2010 Cannondale Trail SL, 1988 Peugeot Nice, 1992ish Stumpjumper Comp,1990's Schwinn Moab
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Bolt is bottomed out and not allowing you to tighten it all the way.
I have 2 nearly identical 3ttt stems, each one came with a bolt. The bolt from one won't work with the other. It bottoms out and causes the exact problem you describe.