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Is your keyhole giving your key a rough ride? Simply scribble & scratch a pencil lead on all the peaks, valleys, nooks and crannies of the key. Don't be shy. Then slide that key in and out of the keyhole for a little while, to transfer some of the lead (well, graphite, of course) into it.
That oughta have smoothed out the problem. Now wipe the key clean if you like.
However, turning the key in the lock is a whole other thing. Can't help you there.
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