If you do, you run this risk - if enough dirt and grime gets up in the thread for it to stick, you end up turning too hard to undo it and then ... whoosh! The whole valve breaks free in your hand, your tyre's instantly flat and you're left cursing and scrabbling around for tyre levers and a replacement tube, because there's no fixing this. And after all, dustcaps don't need to be especially tight - they're only there to keep some dust out, not to keep air in. Learn from my mistake, people!
Note also how, at some point, I must have bent the valve head, probably by pulling my track pump off carelessly. Another schoolboy error!
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