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Step 2Cutting up the valve.
You'll need an old bike inner tube to cut the valve out of. I've always used Schrader valves (see pics), but I can't see why this wouldn't work with a Presta valve.
You can get lots of inner tubes from bike shops. They get a lot from replacing tubes in flat tires.
For this to work really well, cut the valve like the last two pics in this step. The rubber is tapered so that it's easy to push the valve into the stopper (once the cork has a hole in the middle) but hard to pull it out. Also, the tapered end is a bit wider than the rest of the valve, helping keep the valve inside the cork.
You can get lots of inner tubes from bike shops. They get a lot from replacing tubes in flat tires.
For this to work really well, cut the valve like the last two pics in this step. The rubber is tapered so that it's easy to push the valve into the stopper (once the cork has a hole in the middle) but hard to pull it out. Also, the tapered end is a bit wider than the rest of the valve, helping keep the valve inside the cork.
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