Chances are, that a lot of bikers, especially those who started out on complete bikes or just buy a lot of parts have experienced this "oh crap" moment.
All of a sudden, the stem you have on your bike just won't come off of the steerer tube even though the pinch bolts are out, or a used stem just wont fit on. You probably have a pinched stem, or a stem that was over-tightened and doesn't naturally go back to its un-tightened shape even with no bolts. Fear not, for there is an easy fix. All you need is two pennies, the allen key to tighten your stem bolts, and the stem itself. First you are going to remove the two bolts on the back of your stem completely. Then you should start threading in both bolts from the opposite side of where they usually sit, until the tip of the bolt is just showing in the cut out slit between both sides of the back of the stem. Finally, put a penny on the tip of each bolt as you tighten, and the coin should contact one side of the slit, and allow the bolt to be tightened to push up against it. Carefully tighten each bolt 1/8 of a turn at a time until it slips right off of the forks. Follow the same procedure in reverse to install a pinched stem.
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