Nut. It's a nut. Most people leave them off - maybe whoever's helped you each time has tossed it out before you even saw it. It can be useful in keeping the tube aligned with the hole while you're mounting the tire.
Stacey, are you sure you didn't take the nut off before you packed the tube up? Easy way to tell: if the stems on both your tubes are the same length, then they should be protruding the same distance from the rim. If the nut's inside, it would be keeping that much of the stem inside, too.
Anyway, good job and great sense of humor!I wish it were as easy as lph said though. Sometimes people just get in a hurry and make the same mistakes over and over, no matter how much better they know. Not that I would know a-a-a-nything about that
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I wish it were as easy as lph said though. Sometimes people just get in a hurry and make the same mistakes over and over, no matter how much better they know. Not that I would know a-a-a-nything about that 
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