Making your own custom handlebar plugs from wine corks is a nice way of recycling an old cork or two while showing some individuality. It's also an easy fix for handlebars with too small an internal diameter to accept any off-the-shelf plugs -- something that happens fairly often with cheaper aluminum bars.
I've made handlebar plugs from wine corks for a few bikes now, and feel like I have the technique down enough to share.
First, you'll need a wine cork, of course. Any cork will work with more or less the same steps, so I'll leave the wine cork acquistion to you.
For bars with larger internal diamters a champagne cork may work better, albeit with a bit more effort. The basic steps are pretty much the same.
Once you have a wine cork in hand and are sober enough to wield a razor knife, then proceed:
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