I just bought some Zipp 404 clincher's, and the valve stem they came with has a hole in the end, my LBS put some tires on for me and said if I need to put air in the tires the pump would go over this valve stem. How do you take air out of this type of stem? I am wondering how this works?

Thanks.....

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"You're guaranteed to miss 100% of the shots you never take" - Wayne Gretzky