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Old 02-19-09, 08:13 AM
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You should choose a lock with a keyhole that closes. Otherwise, you need to lube the lock, as others have mentioned. I use Boeshield T9 which dries out - I do not want the key to stain my pocket. I pour T9 both into the keyhole and into the openings for shackle ends. With this, the only situation when you become truly vulnerable is in freezing rain. However, it is just as difficult to melt away ice from the keyhole of a U-lock or padlock.

Regarding the situation of a lock frozen for good, that Juha writes about, you can try pouring onto it a pot of boiling water, if you can get that water nearby. If you do not succeed then, though, right away, you may end up with a worse situation than you started with.
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