I had a split valve stem on a trip one time. Took it to a little mom-and-pop tire shop in a small town in rural Florida and the guy there had me fixed up in 10 minutes. He replaced the stem from stock and didn't dismount the tire to do it. Cost all of $7 for the repair. Gotta love those small-town shops. (Oh, and this was on a Saturday morning, too).
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2002 Just Blue XE 4x4