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Looking at quill stems I noticed this rather curious one and I couldn't imagine how it secured the handlebars without an apparent bolt. Any ideas?

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At 10 o'clock there is a wedge that holds the handlebar. Taking off the plastic cap at the end of the stem reveals the bolts for tightening the stem and handlebar.

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    I see, opened up. – whitezo Jun 8 '15 at 13:19
  • it is a nice design, I quite like the columbus stems but this has a certain class to it. – DavidG Jun 8 '15 at 16:05

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