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Join Date: Mar 2006
Location: Regina, Saskatchewan, Canada
Posts: 324
Bikes: Steve Bauer Whirlwind, Nishiki International, Rocky Mountain Element 30 1984 Cinelli Super Corsa w/Campy 50th, Surly LHT.
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Most Schraeder heads have a locking mechanism which clamps down on the valve. It's usually a lever of some sort. Place the head on only far enough to hear some air starting to escape, then engage the lock. Good luck